Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e46a6836a770ba9…

MALICIOUS

PDF

81.3 KB Created: 2021-04-06 14:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 43bca6866fca67d4d47946c1c3f6c766 SHA-1: b1e567067d73a0c35204aa237aa08866720450eb SHA-256: 8e46a6836a770ba95585fb96dc9fc9947241f389e8a98974aa732820da8e06d1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=5th+grade+book+review+example PDF link annotation
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/ratevafinisusuposin.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/1ac3458ca420d89.pdfIn PDF document text
    • https://cdn.sqhk.co/sawitofi/kCidWXd/88614562464.pdfIn PDF document text
    • https://cdn.sqhk.co/noxobabidof/cjfU7he/ladisaxuxiwozuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/QpsrYjb/walking_war_robots_unlimited_gold_mod_apk.pdfIn PDF document text
    • http://hhizmet.com/dd_ee_players_companioncy6h4.pdfIn PDF document text
    • https://relazubaw.weebly.com/uploads/1/3/5/3/135315829/joroxeninasi_sonux_jiwizo.pdfIn PDF document text
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/985196.pdfIn PDF document text
    • https://rusijarumeza.weebly.com/uploads/1/3/1/8/131871651/rafexodajavox_wutufiwimuvu_tuxaleriterakep_melatokoputegiv.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/8I6ibhi/juventus_vs_real_madrid_2020_score.pdfIn PDF document text
    • https://cdn.sqhk.co/pekobenew/hhhfgcJ/18267864474.pdfIn PDF document text
    • https://zakonuvuluj.weebly.com/uploads/1/3/5/9/135984705/7953967.pdfIn PDF document text
    • https://vutavapurazamo.weebly.com/uploads/1/3/4/6/134643269/vevasavopi-zubaj.pdfIn PDF document text
    • https://ratisajaruniz.weebly.com/uploads/1/3/1/4/131455275/6966515.pdfIn PDF document text
    • http://doucheop.xyz/momigarop1zf93.pdfIn PDF document text
    • https://bamegipizof.weebly.com/uploads/1/3/4/6/134647446/2026472.pdfIn PDF document text
    • https://dugufenejoropez.weebly.com/uploads/1/3/0/7/130775504/josuxuni.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/dogazisuze/dotolepuguwebopalabiwal.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/bluestacks_apk_install_failed.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/fisutemogubak.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/ruzuwemigosilirivitafuke.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/23460581651.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_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 5332 bytes
SHA-256: be9e085d4b1d08152217dcec35dba23225f8900804436cebb413ec2981c65459
font_01_sfnt_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 11232 bytes
SHA-256: 95363d9ef68381f57f04d15c8861c6a5839b300b049e2e4237523defd6eda507
font_02_sfnt_off000129b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378