Malicious PDF — malware analysis report

Static analysis result for SHA-256 88064cb11367091b…

MALICIOUS

PDF

72.0 KB Created: 2021-01-10 00:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e307c5f359451bfc11f82e291413aab9 SHA-1: ea11c1e3d0cd22e357f061961510eac9ed28247c SHA-256: 88064cb11367091bbec04a34295025bee33b0c81446d1c7991693e7eab03b70c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a method to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://trafffi.ru/aws?utm_term=insignia+tv+remote+guide PDF link annotation
    • https://cdn.sqhk.co/sarimotel/himghid/road_race_3d_apk_download.pdfIn PDF document text
    • https://site-1174236.mozfiles.com/files/1174236/hornblower_san_diego_harbor_cruise.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/gfyij7o/flights_to_florida_from_new_york.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446773/normal_5fb49ed2372c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5fe66e0ca970b.pdfIn PDF document text
    • https://site-1174847.mozfiles.com/files/1174847/international_business_college_tuition.pdfIn PDF document text
    • https://site-1171806.mozfiles.com/files/1171806/yellow_soulier_sport_femme_kijiji.pdfIn PDF document text
    • https://jewefero.weebly.com/uploads/1/3/1/3/131383264/8539370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_5fe616c976f27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413374/normal_5ff52f83a62b9.pdfIn PDF document text
    • https://cdn.sqhk.co/motakolilo/ghqVdkS/niribaxobim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5f9c5b56eb3be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 5108 bytes
SHA-256: 1f8eee0bc9a1e159f23c2bb1edf9bb7b42346de0d85476e192a3046fd7cfb89d
font_01_sfnt_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 10468 bytes
SHA-256: fc8de9ee3b5bf230176889ba42ca8e65c8159f6bd246af1ac47baddcdb5cfaaa

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