Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91e7bf31c4268a2…

MALICIOUS

PDF

88.4 KB Created: 2021-03-31 18:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d82db5d39408207c5bd7c56ab8b9a68f SHA-1: d4ab74f22c724e4ad4912e06e54bce4011de08ff SHA-256: d91e7bf31c4268a25a0a7c0ee50b28ead6f6426273a85fb30e31ad8b652ebc34
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://midufefew.ru/wix?keyword=what+is+above+trillionaire PDF link annotation
    • https://cdn.sqhk.co/gaxomawelej/dQjcWig/realistic_werewolf_mask_glowing_eyes.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/VNjjxZP/41323255054.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/Ck9jcgH/siwulazebukunirumesekig.pdfIn PDF document text
    • http://wixosefimaba.scienceontheweb.net/shark_steam_pocket_mop_stopped_working.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/jaiilih/pavut.pdfIn PDF document text
    • https://cdn.sqhk.co/vikafaselida/eMol6P0/house_flipper_mobile_pre_order.pdfIn PDF document text
    • http://wuwudikosegukem.mypressonline.com/70752277079.pdfIn PDF document text
    • https://sosepokapebovi.weebly.com/uploads/1/3/0/8/130814645/linagesogefe.pdfIn PDF document text
    • http://suvolupijiro.mygamesonline.org/cardiopatia_isquemica_fisiopatologia.pdfIn PDF document text
    • https://ropoluwuxonixol.weebly.com/uploads/1/3/4/6/134692090/wefejusozumov.pdfIn PDF document text
    • https://tixemuxizufog.weebly.com/uploads/1/3/4/7/134746981/zovewifafu.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/woxewiwupir/66673287463.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_9711721606614b3eb4191ed9eb176f39.pdf?index=trueIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_fa95b0b52f7f47d99b2ed4a84247ea2d.pdf?index=trueIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_858ed874b1314c2f90711f92e13c4ca8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bugutaj/why_is_oil_coming_out_of_my_carburetor_on_my_lawn_mower.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/kevobubawojutikamewiwebik.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_26fe2a829a69443fa93b68d651384cc7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/aldi_talk_aktivierung_app.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_off00011be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE6 4984 bytes
SHA-256: 5b66acca2257259dcb167982a900d1488eb3ffdce1d36ee92099ca3171a49294
font_01_sfnt_off00012ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE1 11644 bytes
SHA-256: 856392e7ffcceb71f9b43bf9c9b1d3223a6260fd420ad42002cdeacfc7861196

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