Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d316d3d929c1761…

MALICIOUS

PDF

85.1 KB Created: 2021-03-06 05:15:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b808baf3109f93f616d874771065b916 SHA-1: 65ead2bbf022ff2745a1f13e4b7c221f55e4a00d SHA-256: 1d316d3d929c1761d6a0bce3538edf75a984bc2ebc2a451929536480918bfe75
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as Pdf.Phishing.Trojan. The embedded URLs likely lead to further malicious content or phishing pages, and the document body, though malformed, contains keywords related to news, potentially serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://lozipotod.ru/award?keyword=front+page+africa+news+liberia PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408330/normal_5ff6bdf1507f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481424/normal_5fe6c5403109f.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/wat_is_complex_trauma.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/11952466688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426550/normal_5fdc8cca070a3.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/79345770270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_603182db84cd8.pdfIn PDF document text
    • http://sekelenogake.getenjoyment.net/brother_hl_2270dw_wireless_setup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475570/normal_5ff2b1cc7d62d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393029/normal_5ffe2050eb472.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/bepukuba/dance_basanti_full_song_pagalworld.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_3248a687e9094ce4b08efd9552b412f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kaxukok/69472018067.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/gojorobevomomewexodur.pdfIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_8247d6bdbf094619b66c78f341e0511f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/automobile_mechanics.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/xidavividuzofasumaxok.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/problem_solving_activities_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/82616832170.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_off000110e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E1 5372 bytes
SHA-256: d114dd966f04a96e7ccf4da91530b05a56e5725f85e41dce63927365cb18dda6
font_01_sfnt_off00012350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12350 10396 bytes
SHA-256: 1a9f659e7a59852fc10fb473276221610745e595d365b6ad46f45efb7e768168

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