Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d479a58fcec18d…

MALICIOUS

PDF

68.0 KB Created: 2020-12-21 22:35:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f404d3fd59321e4b6d2e4ec4d80e3df6 SHA-1: 24d92d65bbfc19ac931e8d66b6fb3e86d051ff5d SHA-256: 91d479a58fcec18d3f182694fe7ca8617e7e5b462e73a278a307fa4f7bae869b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic indicating it is part of a link farm, with a primary malicious URL embedded. The document body, though heavily obfuscated, suggests a lure related to military ranks. The presence of external links and the ML classifier's high confidence score point towards a phishing or scam attempt designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/strik?utm_term=ranks+in+the+british+army+officers PDF link annotation
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/0669419f1a28e.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/migajavapumumo.pdfIn PDF document text
    • https://javagakikidubat.weebly.com/uploads/1/3/0/9/130969576/88de7ae.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/gametuzumax.pdfIn PDF document text
    • https://kijidagidopijub.weebly.com/uploads/1/3/0/7/130776406/2121254.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/46031dc7-3c3f-4c6d-861f-46aa36cd33f9/zurich_zr13_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/corner_liquor_cabinet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ceab181-3bcb-4ec5-96fe-f21425df2166/wetiluwitivozig.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/89551443082.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/digelupaxewo.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/dokkan_battle_androids_sbr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5400184-4006-499e-8b62-83f3bb5b17f3/budir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c01ec733-f08b-4754-a1f6-749926481ee2/super_smash_flash_2_unblocked_at_school_google_sites.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_off0000cd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1E 5404 bytes
SHA-256: 83ee66883d04a3b560d6fa49139ffbc6b1c4f57fb27adac6eea01bfbf757db01
font_01_sfnt_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 10652 bytes
SHA-256: 3d5348875bd863033b17a1aaa418caf8e14f8b9ceccf9b1ab587beb1f3e7cd1c

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