Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2bfaba795a4597…

MALICIOUS

PDF

71.7 KB Created: 2021-03-08 00:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9e20bbdafe489a427fe6eb40bded2fe7 SHA-1: 019286dfb969904738e307cca3f6092afb2a4738 SHA-256: ce2bfaba795a45979f32d282dc8d95b94596b2b47fba179b99cf5224af574645
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The presence of a URL with a 'strik' path and a 'case files psychiatry pdf' UTM term suggests a potential phishing or malicious redirection attempt. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=case+files+psychiatry+pdf PDF link annotation
    • https://cdn.sqhk.co/totimujid/XkCsihg/old_ringtone_free_download_for_android.pdfIn PDF document text
    • http://titonevaj.22web.org/81532481116.pdfIn PDF document text
    • http://wexixexebasober.22web.org/dolutotenofuxivote.pdfIn PDF document text
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/jorowovib_wipakopijutuxo_vagepunukivoj_juwopukor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417315/normal_6023c7b285aa5.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/bUjNhdN/gesajolizupanidog.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/iBhicgg/95764439349.pdfIn PDF document text
    • https://vaxevadokipab.weebly.com/uploads/1/3/4/6/134610393/eed039ea3f19.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/Hs1ias3/40785834030.pdfIn PDF document text
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/b2f418.pdfIn PDF document text
    • https://cdn.sqhk.co/juxezijafoz/iibhhib/27906337989.pdfIn PDF document text
    • https://pelabinal.weebly.com/uploads/1/3/1/3/131379552/xubodesugojeke.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/hfvhbgj/pubg_awm_gun_sound_ringtone_download_mp3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374843/normal_5fc5f59a7dd96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468296/normal_5fe990d9d7ec3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pedijuwugeta.rf.gd/afro_pop_beat_free.pdfIn PDF document text
    • http://wogulixa.epizy.com/handwriting_practice_sheets_lines.pdfIn PDF document text
    • http://loziruwofuni.rf.gd/how_to_pair_scala_g9.pdfIn PDF document text
    • http://midekudaxigol.rf.gd/43586807072.pdfIn PDF document text
    • http://subipugexenijok.rf.gd/6636555971.pdfIn PDF document text
    • http://vudujufilax.epizy.com/73935655162.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_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 5248 bytes
SHA-256: 0d6a45106f7ae8e74732ef64fa39b3692966505800b693aed44aec409061116a
font_01_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 10520 bytes
SHA-256: fd0b6aec47e70ab1d6a1d216cf1565b5bd4cc45ca0be0a48e388431423311d8b

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