Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e68855816235efa…

MALICIOUS

PDF

67.5 KB Created: 2021-02-21 21:04:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e0f0e4149ffad8ac8c450e5d84814445 SHA-1: d971460fa3a7032d00b723e40f19fe4cb42a3c27 SHA-256: 5e68855816235efa2af0e97e5b0cb15d2193d5647ef6fdd421eab8b523455715
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or phishing. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and the ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to lyrics and chords, which is likely a lure to direct users to malicious URLs.

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://jottigo.ru/123?utm_term=gift+of+finest+wheat+lyrics+and+chords PDF link annotation
    • http://the-job.ru/miraculous_ladybug_yoyo_wiki70lc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411935/normal_5fe28b081f908.pdfIn PDF document text
    • http://livethailand.fun/maths_seconde_exercices_corrigszk00p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_5fda854b12cbc.pdfIn PDF document text
    • http://livethailand.fun/443456591631kyro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_601c86d4b8c8d.pdfIn PDF document text
    • http://cg-designer.xyz/dunham_classification_of_carbonate_rocks3b61a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367621/normal_5ffbf5a12ae9d.pdfIn PDF document text
    • https://wiloropijevor.weebly.com/uploads/1/3/5/2/135299547/mifutuvawupubu-vavowawusoxelax-pixutejuzozine-gerazojoro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nilititonawafim/19901907435.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/child_poem_video.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/malalobamoviketuwizojotow.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/burger_king_coupon_mai_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/addictive_games_offline_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF32 5124 bytes
SHA-256: 575c92a77ab650d442a250718a464d46dcdf33866c1fd1c50bd619645e9ae57c
font_01_sfnt_off0000d0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A7 10068 bytes
SHA-256: 2a52757460e6495c8be2f3c3a13691a96fa838b8cd74af02cadef2c8e51450d6
font_02_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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