Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d094c36d2e4f73…

MALICIOUS

PDF

81.4 KB Created: 2021-03-03 15:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 114374948cb346af3911ee64f397f96d SHA-1: e7689ec5fafc9534d51e70f18088a9dfde4f2641 SHA-256: c5d094c36d2e4f7311a7dabbd0d91c4c109f16a6a4970498b7c068261e149dc4
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or disposable domains. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

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 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://pelibifir.ru/123?utm_term=definitionsbereich+mit+maple+bestimmen PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377938/normal_5fff64b0795af.pdfIn PDF document text
    • https://gimisezijumini.weebly.com/uploads/1/3/1/4/131453276/be48cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371265/normal_5fcbfe5ec31c4.pdfIn PDF document text
    • http://usacreditmonitoring.info/liludezauvczu.pdfIn PDF document text
    • http://counterman.ru/peter_zumthor_atmosferas_portugues1v7kl.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/tijisosab.pdfIn PDF document text
    • http://my-favshopc.online/31464336011sv3k0.pdfIn PDF document text
    • http://nigodofifulo.scienceontheweb.net/dewugigafiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403418/normal_5fc7feff90df9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426279/normal_60261211c0fd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483873/normal_5ff907244395a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_5fd612f955de4.pdfIn PDF document text
    • http://damita.fun/occupational_therapy_frames_of_referlm2yd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_603e9f36e7015.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/zunivirupigunakeji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412388/normal_6018d2c39325f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dirosulazab.rf.gd/what_is_a_zeki_tablet_charger.pdfIn PDF document text
    • http://fapugiv.rf.gd/zugasamonibuferip.pdfIn PDF document text
    • http://mevomum.epizy.com/aluminium_sheet_bunnings.pdfIn PDF document text
    • http://jabejanaboz.atwebpages.com/asus_q502la_ram_upgrade.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_off0000fe83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 5396 bytes
SHA-256: 10f61294109751a148fb0ef9fb7f3f7f4ac6287c3c6740584eb31c953dec1218
font_01_sfnt_off000110b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 11892 bytes
SHA-256: 4110e160adcd2650f338f8d7d56b9cb1ce136f17bf33c6d01ed99baba4a78fee

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