Malicious PDF — malware analysis report

Static analysis result for SHA-256 353d304627043c96…

MALICIOUS

PDF

77.2 KB Created: 2021-04-08 02:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: eff30196c516ef6bb70ecc2d8d998396 SHA-1: 2300048e531a298c1a7bf1d98029c04eeeb71b32 SHA-256: 353d304627043c964badefee9b65fcbf1b2fa312929cf28b49eeae08fc0da4d2
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=massey+ferguson+135+tractor+for+sale+uk In PDF document text
    • https://cdn.sqhk.co/gaxumisi/Kx5ieYi/noxuwinozofanem.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/likidemeworpfyda.pdfIn PDF document text
    • http://spencermcman.us/codex_seraphinianus_read_online456c2.pdfIn PDF document text
    • https://cdn.sqhk.co/pavupaken/0jgjgeE/bucky_s_convenience_stores_houston_tx_77043.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/CidNU3e/cat_goes_fishing_2_apk_hile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467912/normal_601fb5c5d27a7.pdfIn PDF document text
    • http://businesshelpservice.com/26230817320jchao.pdfIn PDF document text
    • http://uanews.website/47840832477kerdi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_6036a12103589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_60203a52c2b9b.pdfIn PDF document text
    • http://dsv-trening.ru/monster_truck_mayhem_gameq03hl.pdfIn PDF document text
    • http://tranquils.space/gevalia_free_coffee_maker_deal2ys49.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugituxi/bibjdrh/kuxuzijufapogirimevu.pdfIn PDF document text
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/9422916.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369310/normal_5ff0427f733a5.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/61b39d.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/72d8X16/lego_marvel_super_heroes_3-_piece_set.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/gelawiweza/data_analysis_tool_in_excel_365.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/93839875126.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/video_player_for_windows_10_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/why_do_we_have_text_features.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/formation_bafa_afocal_evreux.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_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 5396 bytes
SHA-256: d026ab1814f308444f723b6dc4d267b976dcf288e271540978e2a91b71cb15ac
font_01_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 11912 bytes
SHA-256: 4ffdd8988ab946bf0a91a1d8a5ef360d7a1b2ef600121b648bed9773658c6ed8
font_02_sfnt_off000118c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C1 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e