Malicious PDF — malware analysis report

Static analysis result for SHA-256 07d5bda3ce776647…

MALICIOUS

PDF

66.9 KB Created: 2021-01-18 05:08:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9e5e430327429f387c1cfb28c21fe6fa SHA-1: c9350c70a2c8c4c1921aced8f39fe1072fec96e1 SHA-256: 07d5bda3ce776647759fdc22ba86e5604fec4eabf483ebb2d5dc02c10f7fe957
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically noted as a link farm on disposable hosting, suggesting an attempt to redirect users to potentially harmful sites. The document body, though heavily obfuscated, appears to be a lure related to 'skeletal system worksheet answers', which is a common tactic for phishing or malware distribution.

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://trafffi.ru/123?utm_term=36-1+the+skeletal+system+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/xakelafu/LO6OTjd/puzaviwav.pdfIn PDF document text
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/laloxazewavikul_dumiwo_wimujomitikusil.pdfIn PDF document text
    • https://site-1210512.mozfiles.com/files/1210512/blank_generic_fax_cover_sheet.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/vakasofinututuwegiva.pdfIn PDF document text
    • https://cdn.sqhk.co/sarowojep/lGbjbhc/22424264963.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/a2iahbL/hair_stylist_fashion_salon_rainbow_unicorn_hair.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/jilakimagib-nenosi-bofuzinawi-kiwodifizuke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://latowetutut.epizy.com/middle_school_uniforms_stores_near_me.pdfIn PDF document text
    • http://luwulifinuneti.epizy.com/funozipif.pdfIn PDF document text
    • http://likijanima.epizy.com/50548811644.pdfIn PDF document text
    • http://fejusadifidexi.epizy.com/cacique_cheese_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/44745733117.pdfIn PDF document text
    • http://kowotasube.epizy.com/punctuation_marks_worksheets_grade_3.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_off0000c9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CB 5492 bytes
SHA-256: 8cac17b6c367865e55f769ccdad7a6eb7159128c0a36b97734e376a0263586de
font_01_sfnt_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 10024 bytes
SHA-256: 34022835116733e1355e1e18f3b3ceb8a8c4275a3f121a185093e1df6187e9ba

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