Malicious PDF — malware analysis report

Static analysis result for SHA-256 1239ae1132226264…

MALICIOUS

PDF

82.9 KB Created: 2021-03-02 18:57:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5c6bc61273c4483823c7a932d5ccb7b7 SHA-1: a935c05118bb358a34d53c994e1715c78ddb47eb SHA-256: 1239ae1132226264a9d00a7cf88edefa69e93683c4f96a81026a7ff8db9ccaa8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to 'ti-15 calculator online free', indicating a lure to potentially malicious websites. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to external content, likely for phishing or ad fraud.

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://jacksth.ru/wix?keyword=ti-15+calculator+online+free PDF link annotation
    • https://sewusadata.weebly.com/uploads/1/3/5/4/135401056/fuwotutubas-kopisida-zafedepaj.pdfIn PDF document text
    • http://djami.ru/halo_the_fall_of_reach_full_movie_downloada8q97.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/tokyo_ghoul_release_date_anime.pdfIn PDF document text
    • https://wovugozota.weebly.com/uploads/1/3/2/6/132695813/7757655.pdfIn PDF document text
    • http://pek-24.cc/sesevesokomarasi0vaeh.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/gdiavtt/zowuxinutalabanu.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/igZLieN/zudibadativ.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/Ijggiii/vogilos.pdfIn PDF document text
    • https://xikematevi.weebly.com/uploads/1/3/4/3/134392378/tubekudonofaz.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/ijjigvi/current_carrying_capacity_of_4_gauge_wire.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/wwADge7/amazon_callaway_golf_gloves.pdfIn PDF document text
    • http://telemprom.xyz/12242398716bepas.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/paropabaru/jizugugewasojoxebabe.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/4060164569.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/lomunuvakag.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_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 4856 bytes
SHA-256: 5784a4015c3417085e10d27badad806be66912d49fade994a8eca01051c6e73e
font_01_sfnt_off00011a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4C 10592 bytes
SHA-256: 18acbdfee61fd3f9684aad98d7e9dd900e867e32283cd5a35c1b811070f060c2

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