Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f05c603b0d4def…

MALICIOUS

PDF

77.2 KB Created: 2021-01-12 10:55:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 48aceeac0290166a6dab5c5bab8600c8 SHA-1: 2a5ee4629087413433c37d69ef41b5d66610d2db SHA-256: b6f05c603b0d4def97a22f53fcb8417e3a44e1ef5814e436f8f06736bc2b9743
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings suggest it functions as a link farm, directing users to numerous external URLs, likely for SEO manipulation or to host phishing content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://trafficel.ru/123?utm_term=introduction+to+special+relativity+robert+resnick+ebook PDF link annotation
    • https://reseviris.weebly.com/uploads/1/3/5/4/135400779/nemezanow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402488/normal_5ff88cad7129e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415964/normal_5fa7ceb018142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5faa43f25c3b6.pdfIn PDF document text
    • https://site-1172290.mozfiles.com/files/1172290/vazekomozererukubo.pdfIn PDF document text
    • https://resumaseba.weebly.com/uploads/1/3/4/3/134318739/1165191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471238/normal_5feb5511b9e69.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/1914822.pdfIn PDF document text
    • https://jovogivodarula.weebly.com/uploads/1/3/5/3/135325070/8113144f8c7dc0.pdfIn PDF document text
    • https://site-1166674.mozfiles.com/files/1166674/honeywell_t6_pro_manual.pdfIn PDF document text
    • https://xudufuzed.weebly.com/uploads/1/3/0/8/130815664/f855a4e29054e9a.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/zuwosil/basketball_legends_game_halloween.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/60671258806.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fbd8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFBD8 25284 bytes
SHA-256: 56b9f6812bf0b7d51ffe59c6d6027e93e604cb57b2e7534e061678d3cad8545c
font_00_sfnt_off0000c7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AE 5368 bytes
SHA-256: f2b5e17576aa92dfad62708edce776ece67e954cbd3a37a9786afd548635b691
font_01_sfnt_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 9832 bytes
SHA-256: 26e70778b56454c5a9dedb566b54ee657405673594a845db38f7f215ed0ef50f

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