Malicious PDF — malware analysis report

Static analysis result for SHA-256 c797a80128b04122…

MALICIOUS

PDF

65.3 KB Created: 2021-01-14 05:19:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a40bd03bc4f18bc366a9528033a10446 SHA-1: 11bab70c9dc7d03a38d72561fb8000437831a41f SHA-256: c797a80128b041221428fa4e2f97d43ab2b650eb387d528629e7711635a9fdfa
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it's a PDF phishing or link farm. The document body, though heavily obfuscated, suggests a lure related to 'Ceragon ip20 manual pdf'. The presence of numerous external links, including those hosted on 'sqhk.co' and 'weebly.com', points towards a phishing or SEO spam campaign, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://trafftec.ru/aws?utm_term=ceragon+ip20+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/pixisuja/hSjjgge/cut_it_brain_puzzles.pdfIn PDF document text
    • https://dafejuxuba.weebly.com/uploads/1/3/4/8/134864571/5617269d.pdfIn PDF document text
    • https://gudifikopar.weebly.com/uploads/1/3/4/6/134627505/fakenanadokupa.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/iiJAih1/kopabed.pdfIn PDF document text
    • https://notilapixoto.weebly.com/uploads/1/3/4/3/134397855/wisikozoja.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/dogazisuze/49324012992.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/gawewexazebugololufi.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/mamis.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/miraj_scintel_character.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/junet.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/3146985950.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_off0000bfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD8 5360 bytes
SHA-256: 0f6b5a2bbcbf84cc13731a016f3fef48ffbd0cfb245b221a389c7f912315097b
font_01_sfnt_off0000d1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FD 11772 bytes
SHA-256: 093210679be6f52a164b070d0395f5573a276738415700dbe1711711cc44aa16

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