Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b128f22a9c28cc6…

MALICIOUS

PDF

72.0 KB Created: 2021-03-02 21:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ec25f3d0a4625638e0ad848cc7e295c4 SHA-1: 1d654b37940ff60e4dad8cf472fb5d330a894429 SHA-256: 3b128f22a9c28cc6679be7166eccce60fb07846668d66a61bec4b0365e24e85c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to a domain associated with phishing and SEO link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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://lozipotod.ru/award?keyword=notacion+cientifica+ejercicios+resueltos+suma+y+resta PDF link annotation
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/90ee775e5.pdfIn PDF document text
    • http://tehnotop.space/baby_george_rotisserie_pork_loin3is8b.pdfIn PDF document text
    • http://evakuator-uga.ru/lilibinokuxuvubufedzl80r.pdfIn PDF document text
    • https://bajomunimiru.weebly.com/uploads/1/3/1/0/131070213/b89e4f2.pdfIn PDF document text
    • http://vash-fasad.live/you_squared_price_pritchett_downxpm0s.pdfIn PDF document text
    • http://zoo-taxi.site/gixupebowivezu0yh7l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_5fd39ba55a382.pdfIn PDF document text
    • https://cdn.sqhk.co/kalusoxat/ngiQjcl/hip_hop_coloring_book_east_coast.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/zufojadibi/billions_arousal_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/movimiento_rectilineo_uniforme_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/hungry_dragon_apk_obb_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/fodosaris.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/clinical_practice_guidelines_francais.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_off0000d9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 5172 bytes
SHA-256: 41e43284330596cdc8115e14e2bf4ba9e7c5e48226e6b666c3efc694d0efcc59
font_01_sfnt_off0000eb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 11632 bytes
SHA-256: 0cedc2b291e2ebacb38bd802f51ad3562131c0634b2c0227eec9444ed3c2ce86

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