Malicious PDF — malware analysis report

Static analysis result for SHA-256 a604a62c2e2fa278…

MALICIOUS

PDF

72.3 KB Created: 2021-04-01 09:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c9e463d773c2182bf60d292527a90e5e SHA-1: be43d3b629a84322a79668a2a940d28bdf569068 SHA-256: a604a62c2e2fa2789c917afc9cc9415aecef93a1def87e382f60cce75c763900
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of URLs like 'https://bologen.ru/strik?utm_term=asus+mx279+monitor+mount' indicates a potential lure to redirect users to malicious or spam content. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/strik?utm_term=asus+mx279+monitor+mount PDF link annotation
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/0decd5ffe.pdfIn PDF document text
    • https://potomifor.weebly.com/uploads/1/3/4/3/134332951/sirulede-japokozuvogapu-towexaj.pdfIn PDF document text
    • http://whysmall.space/niziwijaravijiwagunbctf9.pdfIn PDF document text
    • https://tizonitiwu.weebly.com/uploads/1/3/4/7/134734793/takivasi.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/wujivodezejarisozaki.pdfIn PDF document text
    • http://trokot-shtorki.online/authority_and_american_usage_david_foster_wallacepxi45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485800/normal_6047c73ed087f.pdfIn PDF document text
    • http://ig-soft-team.com/blood_typing_lab_worksheet95zgi.pdfIn PDF document text
    • http://investmag.org/15955407443v6zsi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414495/normal_5fed01f827a67.pdfIn PDF document text
    • http://buytoday.cc/parler_meaning_in_french4i6qi.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/9318714.pdfIn PDF document text
    • http://cardioactiveuficiale.site/25522608838vkhyv.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/3075920.pdfIn PDF document text
    • https://mateboxabivof.weebly.com/uploads/1/3/4/7/134763458/raxew.pdfIn PDF document text
    • http://titanovyi-filtr.ru/altered_carbon_season_1_episode_5_recapa3wc6.pdfIn PDF document text
    • http://kegetisa.mygamesonline.org/negojiz.pdfIn PDF document text
    • http://websecurer.tech/unbreakable_movie_mp4_free2harq.pdfIn PDF document text
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/fbf7e9f382.pdfIn PDF document text
    • http://vemelaribox.getenjoyment.net/fovosevejadilur.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/roku_not_recognizing_micro_sd_cardzjsxs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478141/normal_605d98f104b68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/15014943461.pdfIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/29510641781.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_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 5012 bytes
SHA-256: cbcc4b296ed5d50b3012bf8ce144c8781e64298e668ac39c4517122b28c5e56a
font_01_sfnt_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 10996 bytes
SHA-256: 936a4cfb67cc1efb783424622f8d6c1c32016a696e650712b8d69e3b37a4f6ea