Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c416c7fb429499…

MALICIOUS

PDF

61.7 KB Created: 2020-12-15 03:02:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 050c276467c5222bffd1c7f555be1877 SHA-1: 9a20a8c67752c6cc0c7776ddb906a5834444b596 SHA-256: 45c416c7fb4294992221ba23d92ff615455f24c6f249b728cc8e757b19b88541
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to direct users to potentially malicious or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/123?utm_term=sansui+manuals+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489615/normal_5fcecc662d693.pdfIn PDF document text
    • https://misiwutikamiba.weebly.com/uploads/1/3/4/6/134601431/e303ea.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/bijawixevibo-metamosukes-jekulukiz-tesoromiwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492257/normal_5fa9ffde9a0be.pdfIn PDF document text
    • https://penopamez.weebly.com/uploads/1/3/4/4/134496097/8110089.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/8883624.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/a8a61438-cc00-46f0-b1d9-a9eb1e17c73c/best_journey_love_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6307e41-10ed-4e97-a274-694e53e64b5e/heil_5000_air_conditioner_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d74057-1592-40a9-9693-5fc129dba654/english_vocabulary_in_use_advanced_m.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c80ce069-99b4-4c5a-a62d-ba24b077c936/vetuputatenexeb.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/grammarly_apk_full_paid_version_for_pc.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_off0000b728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB728 5016 bytes
SHA-256: 3864aa031b4314fb657e0aeb77aa95a73a7db41801cc28a49db42798f4369948
font_01_sfnt_off0000c81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81C 10080 bytes
SHA-256: 80b67bc2dc01241e354331372b36cdb67375163e1ac6169255d4be4504774b2b

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