Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ba36167bd67ee3…

MALICIOUS

PDF

74.5 KB Created: 2021-03-28 17:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 902a0c5ac6308bcf191ffee2e275d3ab SHA-1: 228183ced8991eec66aea6d3ec0c6f74e1c1e101 SHA-256: c3ba36167bd67ee3ee8209ebfd05c70517f4ce6fe0841f5d6ed0f35603ae00aa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. The document body, though partially corrupted, suggests a lure related to password resets, directing users to a suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=how+to+reset+password+iomega+storcenter+ix2-200 PDF link annotation
    • https://cdn.sqhk.co/lewulula/Ghjhbge/space_runner_flash_game.pdfIn PDF document text
    • http://zenaxudoriw.mypressonline.com/21372777040.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/is_toothless_real.pdfIn PDF document text
    • http://leporabev.mywebcommunity.org/steuer_anlage_kind_2020.pdfIn PDF document text
    • http://rubokapaj.22web.org/94682517727.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/jekupu.pdfIn PDF document text
    • http://xuzobinemipivor.mygamesonline.org/vemesagijigeti.pdfIn PDF document text
    • http://sotipidikukunow.getenjoyment.net/22129282557.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/hf4gejc/meme_soundboard_apk_uptodown.pdfIn PDF document text
    • http://fiwupejebibogu.sportsontheweb.net/60588395622.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/wngcidR/josafonarulaxopujix.pdfIn PDF document text
    • http://sasavojaraw.iblogger.org/probability_density_function_table.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://natukifuza.atwebpages.com/forodosuvupiruvatixi.pdfIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/53726540554.pdfIn PDF document text
    • http://rovizomaguwex.atwebpages.com/33855747113.pdfIn PDF document text
    • http://bilisedutave.myartsonline.com/66478298598.pdfIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_1e0acb1852ca431085cf877c295da817.pdf?index=trueIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_4b729b596d4f47c2adbb394d7e713650.pdf?index=trueIn 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_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 5788 bytes
SHA-256: 7f9176d5d13abfad8661e9e925f2b6a4a397d6eca06bc5209947ffa7ee64ed03
font_01_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 11040 bytes
SHA-256: 810173183d24eebb6a326db9b371b6744e8a7dbd2e65e9dc334ff7c347eb6ceb

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