Malicious PDF — malware analysis report

Static analysis result for SHA-256 621cc92c1cd4739e…

MALICIOUS

PDF

77.7 KB Created: 2021-03-16 09:12:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: eca34ac6d618dcb5e8822679a7bf3212 SHA-1: f553a107bdd2777ee82006e250df01b508277c1e SHA-256: 621cc92c1cd4739e9a604789a68025a4b805d328317e59a8691710e342011468
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. One prominent URL, https://pelibifir.ru/123?utm_term=5101+cmos+ram+datasheet, is embedded within the document, likely intended to redirect the user to a malicious site. No scripts were extracted, but the PDF structure and numerous URLs indicate a phishing or malware distribution vector.

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=5101+cmos+ram+datasheet PDF link annotation
    • https://vivesajepud.weebly.com/uploads/1/3/0/9/130969004/5808954.pdfIn PDF document text
    • http://ejinaya.com/python_beginning1xmul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_601d9f96577e8.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/a6dde5a6109134.pdfIn PDF document text
    • https://vunafenivanisip.weebly.com/uploads/1/3/5/3/135303543/2816102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481272/normal_600c9fcc43366.pdfIn PDF document text
    • https://nanupubixo.weebly.com/uploads/1/3/0/9/130969545/e1bd308c38ddda.pdfIn PDF document text
    • https://wegejazibeb.weebly.com/uploads/1/3/5/3/135305894/9aceff58e10.pdfIn PDF document text
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/texara-dolabek-nufino-jinagubalasol.pdfIn PDF document text
    • https://zovakilezogavi.weebly.com/uploads/1/3/1/1/131163957/c1a692c62.pdfIn PDF document text
    • https://menufepu.weebly.com/uploads/1/3/1/1/131163725/fca7d33b6ed.pdfIn PDF document text
    • http://cccckkkkkdd.space/2_piece_puzzle_templaten747z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479441/normal_5fef11491deb9.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/litunux/82208300465.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/namaz_translation_in_urdu_and_english.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/kalayil_dhinamum_song_tamilwire.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_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 5368 bytes
SHA-256: e963e5ff0f52d026556666b2c52b1098b2cd3813a6a03b04b581c73cb8025feb
font_01_sfnt_off00010356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 11320 bytes
SHA-256: afe1f0f28c9e8811596d863d52fb3ca6aede9ac7936f26b9618873223c4d8a95

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