Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eaed78e12841d8e…

MALICIOUS

PDF

68.4 KB Created: 2020-12-30 19:02:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7b626138644c64e7b5ca82c1eba96b50 SHA-1: 8a96e11823de9b7a4a14dfe848d8edfb9992c9be SHA-256: 8eaed78e12841d8ebaceceeb82bd4e0836e50356defbc62c8c007a5b21ba63ad
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM' indicating a mass of external PDF links. The document body, though heavily obfuscated, suggests a lure related to 'dancing cubes origami' and includes metadata from wkhtmltopdf, indicating it was likely generated programmatically. The presence of many unknown reputation URLs points towards a phishing or traffic-generation scheme.

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://traffset.ru/strik?utm_term=dancing+cubes+origami PDF link annotation
    • https://cdn.sqhk.co/zegetaru/jelHSZF/blue_houseparty_logo.pdfIn PDF document text
    • https://wotakipinamiwug.weebly.com/uploads/1/3/4/6/134687545/gatozede.pdfIn PDF document text
    • https://cdn.sqhk.co/mawedabe/ihgojbt/semub.pdfIn PDF document text
    • https://cdn.sqhk.co/serojimo/eNpXgjU/78369886288.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446762/normal_5fdf62c71e85e.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/geeLxFZ/4031816549.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/sugisebamugated.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f8f2ab6e6b3a.pdfIn PDF document text
    • https://cdn.sqhk.co/zewuxumaro/Ngj46U4/supipixafax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412415/normal_5fc64ead77bb8.pdfIn PDF document text
    • https://cdn.sqhk.co/simunenij/yLB8ihI/ultimate_dinosaur_simulator_hacked_apk.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/pexodugosa/jamaica_farewell_sheet_music_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/integrals_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/proform_cardio_hiit_trainer_pro_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/elon_musk_biography_book.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_off0000d012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD012 5224 bytes
SHA-256: 05955e57a8907ffb45dc6d0fc8efda0cdb4a56c80af4ba9d4945fe0e850e5db6
font_01_sfnt_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 10376 bytes
SHA-256: a3a9d1b3987fab52fdafd4d81e7c320f32b865f5931488e3f40f3d5ee76541f7

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