Malicious PDF — malware analysis report

Static analysis result for SHA-256 01591bfdd25cb2af…

MALICIOUS

PDF

84.2 KB Created: 2021-02-28 18:29:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 450b12f9b45827c605c2b05792539f98 SHA-1: 3f8ee81bf0c78b9ebc3b73adcddca3428cafac69 SHA-256: 01591bfdd25cb2afd40a98fb43661029d369c84737e0cb0a7021e7fc84114b59
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

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://druttle.ru/wb?keyword=ipod%20nano%206th%20generation%20power%20cord PDF link annotation
    • https://tenomexob.weebly.com/uploads/1/3/1/1/131163969/vilubanalamerozupa.pdfIn PDF document text
    • https://vixadabunukup.weebly.com/uploads/1/3/4/9/134902839/nujagopefufu.pdfIn PDF document text
    • http://boliwamipo.iblogger.org/hoya_safety_eyewear_locations.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/6735231.pdfIn PDF document text
    • https://gunagejosiva.weebly.com/uploads/1/3/0/7/130738835/344aeb.pdfIn PDF document text
    • https://nezopubetuw.weebly.com/uploads/1/3/2/6/132681339/jovonuzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411489/normal_5ff7fbac45f06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_5fd3a43625d3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379220/normal_601b22ab205d5.pdfIn PDF document text
    • https://gigotuvo.weebly.com/uploads/1/3/1/1/131164366/9334432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463308/normal_5fdace947fed2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409421/normal_602680687985c.pdfIn PDF document text
    • https://gideturifit.weebly.com/uploads/1/3/4/8/134887905/7256180.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xikisefux.epizy.com/garmin_nuvi_2595_usb_cable.pdfIn PDF document text
    • http://gaxodisesi.rf.gd/41533877170.pdfIn PDF document text
    • http://xuvotawelotito.epizy.com/adeptus_astartes_kill_team.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBA 5096 bytes
SHA-256: fb001767979835ca8bc4686e7382522f19cf6b801a5b29e019ce8fc7cdf2a6b8
font_01_sfnt_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 10824 bytes
SHA-256: c2eede5f14a87f0e3d5971374b665f7c18ef9d796908a62943dfcb69815b9dd6
font_02_sfnt_off00013528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13528 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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