Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f51f01f43b96b51…

MALICIOUS

PDF

73.5 KB Created: 2021-02-16 23:11:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: facc44a0acc28540bd43039064bfe325 SHA-1: d9737a47333f7d8d375220b894be9320e47a1e48 SHA-256: 9f51f01f43b96b51097d8953196b57522929d0c07581d788164f64880b35de75
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=diesel+power+unlimited+review PDF link annotation
    • https://cdn.sqhk.co/gebitasixa/dggghji/cute_cat_wallpaper_animated.pdfIn PDF document text
    • https://lojigimab.weebly.com/uploads/1/3/0/8/130814508/8520569.pdfIn PDF document text
    • https://beperupofifu.weebly.com/uploads/1/3/1/6/131636755/0a0fbdb7dfd20da.pdfIn PDF document text
    • https://wapaberupuz.weebly.com/uploads/1/3/5/3/135397773/vutejim.pdfIn PDF document text
    • https://cdn.sqhk.co/jepogedofuz/UgfjjG0/inbox_gmail_imap_settings.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/hghbbnb/jovulilepipigazinazupe.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/hkkAvUG/boris_and_the_dark_survival_song_roblox_id.pdfIn PDF document text
    • https://pirovosarelivo.weebly.com/uploads/1/3/1/4/131406751/94479251c84e20.pdfIn PDF document text
    • http://santecmb-sarl.com/sidifixusin6lpgx.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/Pgdjjf3/you_crush_satisfying_asmr_hydraulic_press_game.pdfIn PDF document text
    • http://ipoteka.net/690508793239vq4k.pdfIn PDF document text
    • https://nidabiweni.weebly.com/uploads/1/3/4/8/134865500/muvinoj.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/s75CYjg/bubble_shooter_pirate_2.pdfIn PDF document text
    • https://jixivegeparimes.weebly.com/uploads/1/3/4/7/134749144/4669201.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/Rg5hgih/tinusizibuvuzelob.pdfIn PDF document text
    • https://cdn.sqhk.co/jijipidub/ia4hfih/play_4_history.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwipem/b32idge/merge_super_car_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 5048 bytes
SHA-256: 761bc52f3e4140b2023fd718bd936f172a6e1e921d1c7191a63bcdfd819c6559
font_01_sfnt_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 11356 bytes
SHA-256: 31394d04ff0e3984de6c8523450b93ba06f6268c00b493a7bba976324c808dc9

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