Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dd315979f3e048…

MALICIOUS

PDF

78.1 KB Created: 2021-03-28 09:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b3438fb077556fc200626ac663d4eae0 SHA-1: 89bc49ada1617335b780de5cfe7bf4bc37339135 SHA-256: 81dd315979f3e0489cd68d69f15dfb342b5560801d6eb56dad4965c30463b6f6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as part of a link farm or phishing scheme. The embedded content, though largely unreadable, includes references to 'Java netbeans gui examples pdf' and authoring information, which likely serves as a lure to direct users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=java+netbeans+gui+examples+pdf PDF link annotation
    • http://xapafup.22web.org/what_are_the_different_types_of_ports.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490116/normal_605bc1e628b90.pdfIn PDF document text
    • http://jobs-ingenieur.best/4904814287221mc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407100/normal_6015c7b72c6ff.pdfIn PDF document text
    • http://kefets.xyz/17429593475zqngc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420910/normal_6057b23d516ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_dcbd0399fcdd48b1af1422b840428155.pdf?index=trueIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_b11c52348ffc447aa2d72c1586aec148.pdf?index=trueIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_10bb47cf39954e729b3bfafac1e3c203.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eda6dc9-6add-4079-97c0-56f105e2284a/24469679297.pdfIn PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_0547f7236ba14095b061d6d114ebb3bc.pdf?index=trueIn PDF document text
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_10eb4f82ab4e4edebaf30ad8c0e85744.pdf?index=trueIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_254106cf51a340b8bf9205d43a1709a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac80777-1dfc-40d5-8590-96cb274f5ef4/how_to_reset_maytag_centennial_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c64e3859-f34f-49c2-9969-2b25a418f8ab/can_you_replace_the_garmin_vivosmart_3_band.pdfIn PDF document text
    • http://girinuluzu.rf.gd/bruchrechnung_aufgaben_klasse_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f294b523-2ea7-4c1c-b6c4-a84b8fcc8b3b/tenokexajogofetasiba.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_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 5520 bytes
SHA-256: bf68d9dabb6cec61063285c708206d237390629a8ddcf1103f3d12ff3cfb6864
font_01_sfnt_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 10840 bytes
SHA-256: 3d0ea8533e4769165f7556b55d9c07cf41a2c9971294faa3983940ae9f7da716

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