Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37a14bca960292a…

MALICIOUS

PDF

74.8 KB Created: 2021-02-25 15:07:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d800379a5af1efbc1ce5f03fca1bb37f SHA-1: 75fb36c5262c51a60c81ae15b850bf4c1a5cc056 SHA-256: e37a14bca960292a1300ccbe995ddf9c188dc3f406676d0b02585b450200bef2
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to book search results. The presence of multiple disposable hosting links further supports a phishing or malware distribution scheme.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=real+communication+an+introduction+4th+edition+online+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404121/normal_6009ee02204f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490724/normal_5fe8aaf3d9dc3.pdfIn PDF document text
    • https://cdn.sqhk.co/rogotojuseb/FjwQrib/lozezudojulusil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471106/normal_5ff028a2813b2.pdfIn PDF document text
    • https://kaxojolomo.weebly.com/uploads/1/3/4/8/134885197/5002079.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406787/normal_5fdd08cf902ca.pdfIn PDF document text
    • https://cdn.sqhk.co/zerumowo/fjedgdz/how_to_get_race_against_time_eso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383450/normal_5fdf7b394fb41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492573/normal_603444e5a9b87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382781/normal_60270e0c1a98a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443578/normal_5fea0f326aefb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xadiromawa.epizy.com/skyrim_se_enb_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/firefox_android_bookmark_manager.pdfIn PDF document text
    • http://zipoxibel.epizy.com/acc_aha_guidelines_2017.pdfIn PDF document text
    • http://pekesapawej.epizy.com/sekagukosajedojevusowo.pdfIn PDF document text
    • http://bidemuv.rf.gd/rorirosabos.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/medical_terminology_a_living_language_third_edition_answers.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_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 5176 bytes
SHA-256: 99240de7333400b769e4a84107a1aeb758a18d2b2bc2ff583f46b651c0328ad7
font_01_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 10196 bytes
SHA-256: b69c41a0f5b910148bc9e9934f0cd6588762b560c92b5096cf6c067272d5ba13

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