Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d0d3c6f67e63e6…

MALICIOUS

PDF

70.1 KB Created: 2021-01-06 14:22:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4b29c23c5c8d0c1c6d35450175b2a588 SHA-1: 7534d8aaab859d44893e7a2dad4f29d6c6eb2764 SHA-256: 27d0d3c6f67e63e6750bceb2458cd7e6e248a4412edb85bf752fee2fbf5d8f5c
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector URL. Another critical heuristic indicates a PDF link farm, suggesting an attempt to manipulate search engine results or host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://traffine.ru/aws?utm_term=a+cry+for+help+song In PDF document text
    • https://cdn.sqhk.co/monazaxumol/ijePB2S/54737797487.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366027/normal_5ff5367cef6e5.pdfIn PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/nijob-kumikex.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/igigjdL/shark_world_evolution_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5f1b9aa-c022-4c2c-b2ce-7207350a61ca/samsonite_bartlett_spinner_-_luggage_29.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7459ca7-7eba-49bd-a4b5-4c59571d5b30/xogoxodutexisonozeboxew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64ffab0-fcc5-409e-a68d-2200ce87fac7/stellaris_baldarak_revolutionary_front.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f344e621-5e3f-488f-a0b6-34bf58597364/first_ftc_game_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e2a60a5-f6bf-4ff2-85ff-839e95cfca21/pevobizewamoduviru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/981b81db-d202-4736-956b-f8dcad98f9e2/skyrim_summon_npc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d3b3be3-6f9e-4602-9e20-5f3a1c253883/southwest_asia_map_jordan_river.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/562f6538-4e95-4a8e-9412-03d83901c2e4/13342887216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13c81110-4d0d-485e-b3fa-d6e549a0b844/49136275398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08894401-1888-4087-b9e3-8dbdb1477300/example_of_analogy_test.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_off0000d6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AA 5156 bytes
SHA-256: 129d4f7af080b33d134a516b9c1c7ac6531ee25309bd5311098c5a978cb6a670
font_01_sfnt_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 10684 bytes
SHA-256: 0d1bbf1bb29ef7091462a3efa64bed6eee60a21f966c5407fcb193d6277ab642

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