Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9bd7b63f6cec9bc…

MALICIOUS

PDF

67.8 KB Created: 2021-01-15 23:10:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 82564b459d51e36ec01fc9b9bb592c04 SHA-1: 47a54d038a18d26445876224c5ae6b0e76495e90 SHA-256: f9bd7b63f6cec9bcbaa58446a8d39186acb70b7f21f05665948f8a0d27e4a01c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The document body's reference to "The zodiac legacy books in order" is likely a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/123?utm_term=the+zodiac+legacy+books+in+order PDF link annotation
    • https://site-1174987.mozfiles.com/files/1174987/42628600331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5fbc67e510ef4.pdfIn PDF document text
    • https://site-1171554.mozfiles.com/files/1171554/93201778837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465250/normal_5fdaab9e83d90.pdfIn PDF document text
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/bovonesegiga_joruselinuwevap_wofebuxi_sirujulan.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/2539949.pdfIn PDF document text
    • https://site-1245151.mozfiles.com/files/1245151/lodger_agreement_template.pdfIn PDF document text
    • https://loribipusav.weebly.com/uploads/1/3/1/3/131379532/raparawubivizepisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487184/normal_5fad3a37cedf1.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/8a0bf.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/070e9a.pdfIn PDF document text
    • https://site-1177840.mozfiles.com/files/1177840/interesting_facts_about_meerkats_family.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374366/normal_5fcf31e3c190d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD2 5508 bytes
SHA-256: 502081a7e8260cb3855a91b581621684f1241f6f011edfeace60cf0353d25627
font_01_sfnt_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 10832 bytes
SHA-256: ac528cdf7d452531940684da35c1f59e3fa2c095dd00be216eab15363de068fa

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