Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfb5b635cbf0189…

MALICIOUS

PDF

77.6 KB Created: 2021-03-15 19:16:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9ee091b208ab9e3bc80abbcf61385d2c SHA-1: 22f0a226969e27f3299281e6ee281c422ee90181 SHA-256: 0cfb5b635cbf0189bfe4835750c68d25c5eecbeab4f2becac5ea4a0ed9b4bc3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://kuzutuzo.ru/award?keyword=occupational+safety+and+health+pdf+dget PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369774/normal_6037c3bb3ddbe.pdfIn PDF document text
    • http://cheapkeys.site/4860620258vm5a1.pdfIn PDF document text
    • http://fruktovik.com/vovavas38bhr.pdfIn PDF document text
    • http://gtomishebs.xyz/jolaguxoturenug8lb0w.pdfIn PDF document text
    • http://ionatr.space/sega_all_stars_racing_transformed_charactersn0o35.pdfIn PDF document text
    • http://genoray.pro/schaums_2500_solved_problems_in_differential_equations3ia10.pdfIn PDF document text
    • http://qwertyujg.xyz/fonozkji6n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387427/normal_600825fcc3677.pdfIn PDF document text
    • http://lonagonem.22web.org/kajewifijagobawijoduti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475741/normal_600120d9bc3e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wavitur.rf.gd/autocad_print_transparency.pdfIn PDF document text
    • http://wiribuxumuw.rf.gd/27868365348.pdfIn PDF document text
    • http://bopulamumu.rf.gd/wilton_decorating_tip_chart_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/asge_guidelines_foreign_body_removal.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/71116580649.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/newborn_baby_girl_clothes_for_photoshoot.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/92050636637.pdfIn PDF document text
    • http://tinosizifaxuful.epizy.com/woodchuck_could_chuck_wood_answer.pdfIn PDF document text
    • http://xulifaxamozis.epizy.com/mekunarikuwubaxezup.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_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 5452 bytes
SHA-256: b8a5bc8944d94fdd41b158120bde95dac13fe07216e9f189896e3a6886abd6ac
font_01_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 11128 bytes
SHA-256: 5b88dbedfcf652825240e16b0eeb486834c92b50490f291219e13a14dbdf8d67