Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd544ffdddfa042f…

MALICIOUS

PDF

74.5 KB Created: 2021-01-19 05:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9f6d02c4c0d3e719ecd0c518aad3a944 SHA-1: e7eab73269a5d16cb9bec4aa98bdb42f086c7703 SHA-256: cd544ffdddfa042f2e97b0eafb429b09464c360fa239b7c5cde43dfb97be5f9a
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://leonvi.ru/123?utm_term=wooden+pc+case+design PDF link annotation
    • https://site-1178814.mozfiles.com/files/1178814/nijason.pdfIn PDF document text
    • https://podinelejuwe.weebly.com/uploads/1/3/2/7/132710627/jabig.pdfIn PDF document text
    • https://jojonawizofobu.weebly.com/uploads/1/3/1/4/131438175/c6f477d1ce9.pdfIn PDF document text
    • https://site-1253340.mozfiles.com/files/1253340/25538793610.pdfIn PDF document text
    • https://site-1172077.mozfiles.com/files/1172077/revheadz_engine_sounds_mod_apk_latest_version.pdfIn PDF document text
    • https://kigefewapese.weebly.com/uploads/1/3/4/5/134528385/8377187.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/dazuxujepov/sapezisemugi.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/17046180006.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/prophylaxis_antibiotics_surgery_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/34732819200.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/rocket_league_cross_platform_party_online.pdfIn PDF document text
    • http://fabonek.rf.gd/facebook_apk_for_android_5._1.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/fupiwetemaworanub.pdfIn PDF document text
    • http://bodagoge.epizy.com/78524655944.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/design_themes_for_powerpoint_2013_free.pdfIn PDF document text
    • https://s3.amazonaws.com/damevusom/sizegezogodige.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_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 5128 bytes
SHA-256: 1bb2be7f94538fbe91e69979b8e4a1be74646eaadb33c3a5eaf28ef9058a5bd4
font_01_sfnt_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 11100 bytes
SHA-256: b4a6a5eae6b5ce3d2060b34dbb9d0ade6609bf010b6316ed1e0d7df8ca13c925

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