Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aad2d094b6c2448…

MALICIOUS

PDF

81.9 KB Created: 2021-03-07 03:03:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 34e35c88ff15f8aa65e8f51a5bf1e4f5 SHA-1: 5372090037e25652634c72ed1bdc2cb486ac02d2 SHA-256: 3aad2d094b6c2448e5293b544989c3664d8c9da9db7b0e775ecbf676c26549c8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The primary malicious URL identified is https://vilenefex.ru/123?utm_term=basic+electronics+for+arduino+makers+pdf, which is likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/123?utm_term=basic+electronics+for+arduino+makers+pdf PDF link annotation
    • https://sedarujewajoto.weebly.com/uploads/1/3/0/9/130968957/tuwetuvojol-pobuto-fijixogamep.pdfIn PDF document text
    • https://lobovalosidim.weebly.com/uploads/1/3/1/4/131437181/a6c2fe139c73f8.pdfIn PDF document text
    • http://trelon.fun/neumonia_neonatal_20187ydzc.pdfIn PDF document text
    • http://bonifacy.site/19307484pp5o9.pdfIn PDF document text
    • http://azorocheat5.xyz/jorelulakuku96hki.pdfIn PDF document text
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/4abd1a16ca0f39.pdfIn PDF document text
    • http://rentline.pro/printf_format_boolean_cj1yhy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/965abd14-bce8-46fa-8216-706dbae9236d/what_is_the_warranty_on_rheem_water_heater.pdfIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_88a314aae64d43599c7b6de51f107194.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_654fc4e980d849afae26449f0e84d9ca.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_02a9709a933a431f95c4f54e121cafaa.pdf?index=trueIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_46f43c5a0ec64ed0814aa05c30e1ee7b.pdf?index=trueIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_16c6bd7b01b0443e86153a750dcfc2ad.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_adac9639c2c54f2c816e2fe3ce71ac2a.pdf?index=trueIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_8eeafd87a1e141fe8f5747e0130bb9e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68095444-bef7-45ca-8fe9-0ec7c61beaa6/a_series_of_unfortunate_events_book_11_read_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e052f787-034e-41ee-bf6d-aea033cb8b72/what_was_the_purpose_of_adding_the_bill_of_rights_to_the_constitution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3063a7da-88fe-4d8b-99b4-e0de92f829e2/94402132913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa22c649-0ee4-49c8-a51e-d3b52c68daaf/gimpy_meaning_in_gujarati.pdfIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_42a3c15b46e44ac482118504f1ce09bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87501ddc-8d72-4174-b133-97b32d452725/cisco_sg200-26_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/554f641e-40bd-4dfc-bb0b-3ca547f4a053/librecad_autocad_commands.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_4a810d1387644ea988d9036b748dd482.pdf?index=trueIn PDF document text
    • https://75edee45-cd08-43cb-a752-0c33e5c2343f.filesusr.com/ugd/a7c173_804714685b9e417fa1b418452bf99e5c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 5296 bytes
SHA-256: 3bcbe513c33a6fc85f1fe557dba49074b1b6ef4ba5e9b4e4ed475317f9d89b0f
font_01_sfnt_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 10588 bytes
SHA-256: 1b09d379250efdc2d8c9c8b4b85f8993104025bd4fbcabb1eb1b3a8e8622d8f8
font_02_sfnt_off00012b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B73 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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