Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d2e4359d7fe088…

MALICIOUS

PDF

73.7 KB Created: 2021-04-05 05:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b794997c0af17583edbbe93ec41a012a SHA-1: aaaa185e205a142dc9f55773f4f0433af6a3ecc5 SHA-256: f7d2e4359d7fe0880db496185752af13046b86e149858b602a71d492096de11d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attack pattern focused on redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/strik?utm_term=spirit+blossom+thresh+minecraft+skin
    • https://minetoleletumu.weebly.com/uploads/1/3/4/7/134767865/peguzu_vegofelatibag.pdf
    • https://worikasef.weebly.com/uploads/1/3/5/9/135966717/jogopapa.pdf
    • https://cdn.sqhk.co/nijalemivowo/jbaUhj6/bopisipijunorigupedavuku.pdf
    • https://dasubafetimediz.weebly.com/uploads/1/3/4/6/134673415/7032956.pdf
    • https://cdn.sqhk.co/malevevipali/gKaruZz/jeparubikofexejesoxepi.pdf
    • https://bazitakitavame.weebly.com/uploads/1/3/5/3/135394276/71493.pdf
    • https://cdn.sqhk.co/ripowusaro/hcUWOwz/23056434102.pdf
    • https://bazugibeb.weebly.com/uploads/1/3/1/4/131453150/3b6fbb3.pdf
    • https://xikipavukageza.weebly.com/uploads/1/3/0/7/130776529/gunatufev-laxuvewumonez.pdf
    • https://tesujirigagorin.weebly.com/uploads/1/3/4/8/134869290/mavolewolufam-zawalorajoda-gabikalode-lufewopozubuvol.pdf
    • https://cdn.sqhk.co/guwuweri/sMRABgi/the_environs_survive_mod_apk.pdf
    • https://xesanojazal.weebly.com/uploads/1/3/0/9/130968931/fanexivimigavojoti.pdf
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/e7b37e29.pdf
    • https://govodiroruje.weebly.com/uploads/1/3/0/7/130775462/zowut-pegekijadelonu-kaxakofuko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/25be3f56-6921-4fde-b5e6-3ae8a854f88b/what_education_is_needed_to_become_a_computer_programmer.pdf
    • https://s3.amazonaws.com/lekezaru/53154750993.pdf
    • https://s3.amazonaws.com/divikufifir/apostrophes_to_show_ownership_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/3c901c80-f104-4f1d-8ec3-b720aa663bcb/how_to_use_epic_emr_at_home.pdf
    • https://s3.amazonaws.com/jovekus/nudame.pdf
    • https://s3.amazonaws.com/satuja/giwirizukuvibebotijomolaf.pdf
    • https://uploads.strikinglycdn.com/files/5d5d9f89-4c93-4c99-b25b-9d61215c88f0/how_to_calculate_angles_of_a_trapezoid.pdf
    • https://uploads.strikinglycdn.com/files/2003cb19-1fd2-44fa-b82e-3333caa47e2f/pekofoji.pdf
    • https://s3.amazonaws.com/lizuseguwix/what_is_the_salary_of_a_mechanical_engineer_with_career_experience.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_off0000e302.bin
dbd6c696b0e7d6538fe33962651d0a63185a9478642be32b168476ba275a8c7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 5560 bytes
font_01_sfnt_off0000f5bf.bin
8f77d851eb24195cbdac3012e2299eb3f2841e3a0f6402c92d5446314f5bfe8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 10576 bytes