Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb28404214ccc338…

MALICIOUS

PDF

110.0 KB Created: 2021-03-14 21:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30dfa5642df8698e64d8571231290b7a SHA-1: 7265f5ec72d7af77299af5497d384e86ecd21f5c SHA-256: eb28404214ccc3387680c38e6b2d456247ec7cb03bffc1210eae94ff48dd64a0
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a site offering 'pro muscle t5 reviews'. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The presence of embedded URLs and the link farm nature suggest the primary goal is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/wix?keyword=pro+muscle+t5+reviews
    • https://cdn.sqhk.co/ranemagesoga/iijjpgg/zalejufuzoka.pdf
    • http://fanutoragozogow.sportsontheweb.net/kolimoripusapoxer.pdf
    • http://gidujoluj.mypressonline.com/gomavazononamegawi.pdf
    • https://cdn.sqhk.co/petawelesup/j81giCG/72709705313.pdf
    • https://cdn-cms.f-static.net/uploads/4480589/normal_5fd179e755dfe.pdf
    • https://cdn-cms.f-static.net/uploads/4446155/normal_601fa95a30d2d.pdf
    • http://lirinevewafa.mypressonline.com/dodutinamufagojokixorujid.pdf
    • http://kowojolajamuv.getenjoyment.net/mosenebi.pdf
    • https://cdn.sqhk.co/fewoxenovof/dcQM94Z/weird_fighting_sports.pdf
    • http://lozomaneje.getenjoyment.net/law_enforcement_sniper_training_texas.pdf
    • https://cdn-cms.f-static.net/uploads/4369509/normal_604d295a0ea8a.pdf
    • http://pagavopalubutu.scienceontheweb.net/fovezopewa.pdf
    • https://static.s123-cdn-static.com/uploads/4451028/normal_5ff93395ec3e8.pdf
    • http://jifarobajis.sportsontheweb.net/7730889895.pdf
    • http://xozowilozoga.mywebcommunity.org/what_are_the_main_traditions_of_christianity.pdf
    • http://rebezun.mygamesonline.org/90703768138.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://sazasewugekupej.onlinewebshop.net/zepizav.pdf
    • http://jujobope.atwebpages.com/wuzosajobusejutakolukuzob.pdf
    • http://dasobiviwadodaj.atwebpages.com/25003144283.pdf
    • https://uploads.strikinglycdn.com/files/9718c4fc-3cbf-4595-9d78-8f174d071b02/the_food_safety_modernization_act_fsma_signed_in_2011_is_praised_because_of_the_focus_on.pdf
    • https://uploads.strikinglycdn.com/files/671bf1ce-3879-4357-bc3c-220dfc90fd97/como_es_la_destilacion_fraccionada_del_petroleo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016769.bin
5cc2e0a79789cb1efa325aeae2c36f732ed6cd40d0033f68bb4d04dffb32e436		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16769 4788 bytes
font_01_sfnt_off000177cf.bin
ed06d716fe555fa70f9131e8f41ca78b4223f8884f20ccb50f0f0b8a2b962f8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x177CF 10664 bytes
font_02_sfnt_off00019c45.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19C45 4324 bytes

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