Malicious PDF — malware analysis report

Static analysis result for SHA-256 1718cf2e23d69dcc…

MALICIOUS

PDF

72.1 KB Created: 2021-02-16 18:49:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 93134954dfb928dc8ec6046ef38f3fd9 SHA-1: f63c7f11f5e323da836c1d61f19930211316a648 SHA-256: 1718cf2e23d69dcc5a776c6b8ef0114078953fa253979f4d23d682d4087abbbd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further payloads or phishing content. While no scripts were directly extracted, the PDF structure and link farm heuristic point towards exploitation for client execution, potentially involving embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=ca+ssid+number PDF link annotation
    • http://naturwows.space/suxovototabixumbvwne.pdfIn PDF document text
    • https://munipepuxorikoz.weebly.com/uploads/1/3/0/9/130969311/pizujij.pdfIn PDF document text
    • https://betunujaxub.weebly.com/uploads/1/3/1/6/131636576/visitozeru.pdfIn PDF document text
    • https://vomizovuzib.weebly.com/uploads/1/3/1/6/131637161/saravetemodok.pdfIn PDF document text
    • https://zuzuxaze.weebly.com/uploads/1/3/4/0/134040629/dalekaviwu_beverifi.pdfIn PDF document text
    • http://lumurezekosarew.66ghz.com/59690887073.pdfIn PDF document text
    • https://nudiwosesi.weebly.com/uploads/1/3/4/3/134317077/rubaduvul.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/cSiehjw/50271031776.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/f7IihmK/lg_mobile_switch_iphone.pdfIn PDF document text
    • http://pedron.fun/7319868759206kp4.pdfIn PDF document text
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/9a9a2ae.pdfIn PDF document text
    • http://leree4.club/6329704060927885.pdfIn PDF document text
    • https://movojedafep.weebly.com/uploads/1/3/0/8/130814843/namamekida_jusabizatof.pdfIn PDF document text
    • http://instasurprise.online/crystal_report_for_visual_studio44ohv.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/ge4jd02/free_games_like_world_of_warships.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tezuzatarezoz.epizy.com/piper_cherokee_160_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/bosch_exxcel_express_dishwasher_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/schindler_s_list_music_violin_sheet.pdfIn PDF document text
    • http://bigisewolax.epizy.com/android_9_split_screen_shortcut.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_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 4984 bytes
SHA-256: d63e4a26add9d5e9565c623bb71a3b69b691161df4fb407ce346f5920d2795a7
font_01_sfnt_off0000f07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 10144 bytes
SHA-256: fd98882e5b4ab90772587ee4778da0ab52e6f8aed3c63c31bb87e192d2c68023

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