Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27a22a0bf76ca65…

MALICIOUS

PDF

71.1 KB Created: 2021-03-19 19:03:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f50538667fe04b526c8f43795b5f10ca SHA-1: 546f314c9d78453da2e7fc407fb98ee6b632978e SHA-256: c27a22a0bf76ca65d16d62cb90fa9c9ec53a7a6bec901a72e913b806874e08fc
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-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://ponafet.ru/wix?keyword=traditions+and+encounters+a+global+perspective+on+the+past+3rd+edition+pdf PDF link annotation
    • https://nilozirarita.weebly.com/uploads/1/3/4/4/134463528/lanovorupo.pdfIn PDF document text
    • https://cdn.sqhk.co/kozutani/Hhcific/ccna_netacad_exam_answers.pdfIn PDF document text
    • https://burigazipe.weebly.com/uploads/1/3/4/7/134764527/mimijanodoze-difawiruvezudo-poxak-lowuvuseximixep.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/Nvlhglh/protect_girl_child_essay.pdfIn PDF document text
    • https://cdn.sqhk.co/surudije/fhibDie/faxol.pdfIn PDF document text
    • https://marikikugawu.weebly.com/uploads/1/3/5/3/135326377/pulerolowum-tuvodufopa-voluzogodo-tiwasojimigeti.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/2Ljf9om/93689036367.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/gdgdcOX/world_war_ii_pacific_battles_map.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/ijelHOS/18006952889.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/jisoQhe/samsung_email_gmail_unable_to_validate_account.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/iiiWGmk/kigonelodawusenusoli.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/Z773ifX/speed_hiker_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/LSeoii4/pirate_craft_activities_eyfs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_cd63345503794d32b7c994f3c47b26a2.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_0921235cb8cf48c4854db177902f93f2.pdf?index=trueIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_c51d7e37a19a437b89282ec7305aa45d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zupenafud/saviwibafowure.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/photosynthesis_virtual_lab_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/i_got_rhythm_sheet_music_piano.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_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 5728 bytes
SHA-256: 57aa7ee6972f09ba484ebb72c9e19681fcf10efec5d0ec8db32ef0c82872c874
font_01_sfnt_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 10676 bytes
SHA-256: 1cfc0a121a35de930a3bdc0c79596c5a49b9d275874d8a634bd607b794c28ea3

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