Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d18358909bb4c8d…

MALICIOUS

PDF

73.6 KB Created: 2021-03-18 05:20:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2f96bd31e101c45613943128cd379db7 SHA-1: 65fe3899a44082dd50dc0f6472f9417a8df1c0d6 SHA-256: 5d18358909bb4c8d81325c800915b4537d92b59b3f85f66f1b2e350c119baff8
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to redirect users to a large number of potentially malicious sites. While no scripts were explicitly extracted, the presence of external links and the overall detection profile strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://jumiwimov.ru/123?utm_term=citizen+in+the+world+merit+badge+worksheet PDF link annotation
    • https://kuwuxezito.weebly.com/uploads/1/3/6/0/136090431/kinidinel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5fcdb8d3b80a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_603b6678bc7d6.pdfIn PDF document text
    • https://sifirugosiwoxam.weebly.com/uploads/1/3/1/3/131384024/987830.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445877/normal_6004854f1f692.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/mateliwobesurubovox.pdfIn PDF document text
    • http://c-advance.space/nimuketanazajugedewivu92pq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466386/normal_6051e7ce65813.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452148/normal_5fe01006d9c09.pdfIn PDF document text
    • http://shopmzm.site/julonovajomii0sgv.pdfIn PDF document text
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/9a120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470211/normal_602899fe81d73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414847/normal_600e881f0b853.pdfIn PDF document text
    • http://7evenrp.ru/eldest_the_inheritance_cycle_book_2_audiobooktkg0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/python_3.7_write_to_text_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd55a8a-821c-4e8b-9117-cd399e866d1e/kojerubaruxelonop.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/expected_credit_loss_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc1678d1-60d3-45ec-982b-415e024efbf6/97920550316.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/printable_lined_paper_template_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/561850cc-fd23-4014-9faa-b4edf0ecb5e2/71772513299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd4c3b1-4c13-4365-a18d-49d2ebb4efaa/how_to_reset_acer_laptop_password_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b7a40a-ca96-4646-83c3-c5b564ac0591/97042289735.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/tadupavevu.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB8 5488 bytes
SHA-256: be3cb25204a31e94132ce7b0cd92389a0892d841182d4e963662ae124cf4fd6a
font_01_sfnt_off0000f247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 10780 bytes
SHA-256: a4477bee42b7487b0aeb684ef47af4a08dd3d2e570549e733f9f0f0d0b4f9180

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