Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dee232c2a2f8b59…

MALICIOUS

PDF

82.8 KB Created: 2021-01-27 02:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: fac40644a6eac81ac646be5072186c9f SHA-1: 0a00d1b65851bb87b93e886892a05d1c82395e39 SHA-256: 1dee232c2a2f8b59982ec9609c95051b68775c8a6fa65e4c2b8fc61571f729a5
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains or link farms, suggesting a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/123?utm_term=dog+crate+covers+diy PDF link annotation
    • https://cdn.sqhk.co/zifiguwosu/ggjGibW/mefulo.pdfIn PDF document text
    • http://medyayazilimtr.com/95461982510xns1.pdfIn PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/rurabakobad.pdfIn PDF document text
    • http://bonifacy.site/vuxikidixadorirosutulilucoqzn.pdfIn PDF document text
    • https://gafukarufigak.weebly.com/uploads/1/3/5/3/135309608/27f89.pdfIn PDF document text
    • https://pigegiwoxare.weebly.com/uploads/1/3/5/3/135385020/b05a642.pdfIn PDF document text
    • http://meinekarten.best/libro_de_mitos_y_leyendaslcbvv.pdfIn PDF document text
    • https://kajugomurabamuj.weebly.com/uploads/1/3/0/8/130814292/6170732.pdfIn PDF document text
    • https://cdn.sqhk.co/sazobenapur/JOjgige/bajular.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/IhhFjaj/asmr_slicing_mod_apk.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/4369495.pdfIn PDF document text
    • http://bupro.asia/ritadidolevujijevpe809.pdfIn PDF document text
    • http://adanakebap.org/didetedoc4u09.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/zicuije/77855456950.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
    • https://s3.amazonaws.com/xonaxevetaf/tv_now_guide_nz_city.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/agricultural_engineering_projects_topics.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 2960 bytes
SHA-256: 3c6502e04658d985b37ed967139d4b1bb7136c1c8ff06868e6b64c17630b7d50
font_01_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 4916 bytes
SHA-256: c5d453f8a20b3f2b85827816e520146f4ca93a20b77ab707f2200e57673c52f7
font_02_sfnt_off000109bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BD 11264 bytes
SHA-256: 9f9b768bdfc98061946714fd8bd5a207a0e56c0cd44592e8b3c2a432d5686f9a
font_03_sfnt_off00012fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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