Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5c3311f41b8250…

MALICIOUS

PDF

77.4 KB Created: 2021-01-05 05:19:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e3fafd22672b68261daefcbadcce41f2 SHA-1: 718d4d4b1017721760506c8af8d7b63b79068b40 SHA-256: 7a5c3311f41b82506673f9d6a0391c213ad4d042deb6c60cb7d5e01fd4a60f5b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or scam attempt. It contains a large number of external links, suggesting it is part of a link farm designed to direct users to malicious websites. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://trafffe.ru/aws?utm_term=lagu+op+akuma+no+riddle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415327/normal_5fa0ff5f93d7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_5fd15365004b5.pdfIn PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/3990231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417319/normal_5fbb1f82f1587.pdfIn PDF document text
    • https://jitifawe.weebly.com/uploads/1/3/5/3/135327084/sipazufufi-todonopus.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/1b692f33-9bb6-4faf-8832-8f59fc4c1bb1/10379047532.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/bolijap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e98005e-56dc-4006-ac13-c7b38cf6efae/the_modern_gentleman_shave_cream.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/hacking_guide_books.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/function_of_bushing_transformer.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/57178410830.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/bass_booster_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e39cd2-ec65-4cb8-97f9-0ee4b6a76d55/vururudebobuxulexekoliken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00ca9113-67c4-4713-803e-818ea95aac63/79871672337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/892acddf-7964-47f0-b787-f8e8745e22dc/starbucks_4_day_work_week_study.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 4828 bytes
SHA-256: 0fa0f4344a49a611b5130cede1ea86d706808ba8b3b5006e494d5f34673c77c4
font_01_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 5108 bytes
SHA-256: e686d5d59a2e839fa6d82a1de682be416278ec4f2f86245071af75b9898865ad
font_02_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 10760 bytes
SHA-256: 949b215b713eb65b9b03d8a7d3a16e42a59a15c993cd4c1ec92f29a49fd0b3f0

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