Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fc17546b394f74…

MALICIOUS

PDF

109.5 KB Created: 2020-11-10 11:51:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5db8ecd842058eaf0f49c3bff1e45950 SHA-1: 1bf62e5fd85237b66179edcaaf6548b3503673ff SHA-256: a7fc17546b394f748ccd9ddd94e43d775deedb6c6f663a954d5221a34e3ee375
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://trafficel.ru/123?keyword=osrs+score+a+goal+in+skullball+clue', is embedded and likely serves as a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafficel.ru/123?keyword=osrs+score+a+goal+in+skullball+clue PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417988/normal_5fa6e8b9f0508.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/geferuxinas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5f8ca1d929a78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_5f918ab8c66ca.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/tupigidu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5f8aaf7a6e7ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460072/normal_5fa7426b7d4ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_5f912d7485bb7.pdfIn PDF document text
    • https://pazolumaf.weebly.com/uploads/1/3/4/3/134356568/lewuwigitavev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375700/normal_5f971b3255f25.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/bikikanafopavu/brother_ls_1217_sewing_machine_manual_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/tugubajedibovumuz.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017d93.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17D93 24852 bytes
SHA-256: 117db9500d1b45d85db6c270355f17d63e5925c311e87838052dbd79865da080
font_00_sfnt_off000143a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A1 5200 bytes
SHA-256: e2f83d717e6ae2da207f40bd48a687c17a65c625491c905c69399dfc791c4268
font_01_sfnt_off0001555f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555F 11692 bytes
SHA-256: 403d4eda24698c550a8ba8b5677e138760a93b7e1dcae74605bb2596a378c0a7

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