Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c867940e609460…

MALICIOUS

PDF

80.6 KB Created: 2021-04-26 10:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13c71a41163931ff80b3b833bc8a4d03 SHA-1: ba1b9bf09ae52bd8a39f9d95e666157ba33661bd SHA-256: b8c867940e60946073257feea68b43a02b45e49be92c30c89e63478fe2a4a48b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and it contains a large number of external links, indicating a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially malicious external sites. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=how+do+i+make+an+acer+recovery+disk
    • https://cdn.sqhk.co/levowexesu/hfihajb/pixapenepapuza.pdf
    • https://vefawotujetebab.weebly.com/uploads/1/3/4/6/134651081/pededefuxezob_mazikam.pdf
    • http://appless.space/dolby_profile_selector_not_working7wa7a.pdf
    • http://robot3.site/god_eater_resurrection_bullet_guide2jtpx.pdf
    • https://gimelukisisira.weebly.com/uploads/1/3/4/0/134040832/0e3f98.pdf
    • https://cdn.sqhk.co/leluforeref/amfIkRY/18943281123.pdf
    • https://bininadaxirag.weebly.com/uploads/1/3/4/4/134475951/gufax.pdf
    • http://copyright-services-us.com/volugofujubaworowoniwib97i74.pdf
    • https://cdn.sqhk.co/zuxatotukaru/wnNhhjh/47712201270.pdf
    • https://cdn.sqhk.co/liviberox/QBjbqge/65951220685.pdf
    • https://cdn.sqhk.co/lofakekaf/aghdiir/hask_hollywood_picture_quiz_answers_2020.pdf
    • http://kdghy.online/zetejitedovamesevwmcth.pdf
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/640a535c1b995bb.pdf
    • https://cdn.sqhk.co/sobexofap/heijgg1/zejejudapuxiv.pdf
    • https://gufonesugoxemi.weebly.com/uploads/1/3/5/9/135960051/5803838.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xonezerimagu.rf.gd/firupoxinuxuw.pdf
    • https://uploads.strikinglycdn.com/files/f893a71b-a99e-4cb4-9b33-3d805af09bbc/will_after_we_collided_be_released_on_netflix.pdf
    • https://uploads.strikinglycdn.com/files/f550a6f4-cb2d-4a36-b2cc-20449a609ba9/fodovubuzuf.pdf
    • http://zerojalosa.rf.gd/11117191744.pdf
    • http://lebigegapil.epizy.com/bekiwipiva.pdf
    • https://uploads.strikinglycdn.com/files/0c24e6b4-2a2d-418b-aa11-f7035fd16820/how_to_disassemble_pavilion_dv6.pdf
    • http://binewazuliv.epizy.com/linixeve.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb3b.bin
968133e27116a153305a5243057376a0e820327b11521778d82f540da2bbd6c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 5332 bytes
font_01_sfnt_off00010d5f.bin
e620513733f4b251b16771eaf22a4bad18d7bbf9e180e2f9de9c7e8dd1610202		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 11688 bytes

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