Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf76c32aa9fe15b…

MALICIOUS

PDF

70.4 KB Created: 2021-04-07 14:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 26a6c6bbc73b55721e7e2de75bce774e SHA-1: ee7206356a7485e5e420168db4d811dcb88663b3 SHA-256: cdf76c32aa9fe15bf136e86884961b83f4dfae307169bfdaa85d4df28af01c1e
186 Risk Score

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 domains, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns align with common techniques for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=clinical+mental+health+counselor+salary+texas PDF link annotation
    • https://cdn.sqhk.co/gazegarov/fhgK0Xi/spray_paint_puzzle_pieces.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/3hgid5U/asteroid_hitting_earth_2019_october_3.pdfIn PDF document text
    • http://vienvozvrat.site/55556092406vfe3w.pdfIn PDF document text
    • https://sepikiduluwad.weebly.com/uploads/1/3/4/4/134487701/8909977.pdfIn PDF document text
    • http://senteber.site/19284449174ex27r.pdfIn PDF document text
    • https://cdn.sqhk.co/kifateten/difjeeY/81747692329.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391605/normal_5fe3f46de81ba.pdfIn PDF document text
    • https://sukopowe.weebly.com/uploads/1/3/4/4/134499194/befepigifupipam.pdfIn PDF document text
    • https://wudemivezetuf.weebly.com/uploads/1/3/4/3/134318680/banebopukolur-werogasimavo-nifovadegif.pdfIn PDF document text
    • https://cdn.sqhk.co/wafizogep/Qhj1idL/mazajixuzajaz.pdfIn PDF document text
    • https://xobisejuzato.weebly.com/uploads/1/3/4/6/134694252/5354aa9c4b.pdfIn PDF document text
    • http://storefromit.pro/the_dark_knight_joker_wallpaper_downloadmkyvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459935/normal_5fddb1663851f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491673/normal_5ffdffd484c2c.pdfIn PDF document text
    • https://cdn.sqhk.co/doxinotilid/FApHFhe/sokonef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/daxemo/fl_studio_para_macbook_air.pdfIn PDF document text
    • http://kibototudezusob.epizy.com/flat_sale_agreement_format_in_marathi.pdfIn PDF document text
    • http://beviwemeladi.rf.gd/raxedumaxisuvuwezi.pdfIn PDF document text
    • http://wotujemun.rf.gd/word_count_mapreduce_program_in_java.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/29083812114.pdfIn PDF document text
    • http://lubesugoninop.epizy.com/18605621739.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_off0000d6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F8 5116 bytes
SHA-256: f26032ff84d2be386542b6292cdb489c5d9bcc3e2b77ddff4006b6316f9e7263
font_01_sfnt_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 10412 bytes
SHA-256: 1d7b806507b52f99eae75b85c69cfd7fe27a03ed6c2422f34db7500d38da9b68