Malicious PDF — malware analysis report

Static analysis result for SHA-256 163bbd75e669ce2d…

MALICIOUS

PDF

70.0 KB Created: 2020-11-18 19:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c35aa030ce3f21a1f6c514c13a4e4e75 SHA-1: 77a719a465bc42046dd3fb8ed82130113927f3ae SHA-256: 163bbd75e669ce2da382b58a72ef38b407b03ae1cf896e66a13b4a61193bc357
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL identified as a potential phishing or malware distribution point. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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://traffnew.ru/strik?utm_term=ancc+med+surg+certification+review+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469834/normal_5fa522673274d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_5f9e25cf2db78.pdfIn PDF document text
    • https://gupekuvexo.weebly.com/uploads/1/3/4/6/134610658/3237713.pdfIn PDF document text
    • https://xaxazusilu.weebly.com/uploads/1/3/4/7/134757455/ab81af6ccf.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/70283b6e-4985-442f-89bc-2fa8b504cfa8/94303931908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dd449f8-42e6-40b1-8be0-2b766b17856f/semowoxusone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a46d11-bdc2-4f78-bb8b-baf8cbc3f6a6/solving_quadratic_equations_by_graphing_algebra_2.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/fimudonevex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec51c385-a60a-4ca5-886e-919577e4aee4/bitozekivunisokimaz.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/6787851045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bdfb755-6a27-4278-811f-5663013a922a/bnp_paribas_cardif_emeklilik_ayrlma_talep_formu.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_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 5656 bytes
SHA-256: 9245aa9f660c88c2a9b0cc877b33294aa4ea25e59393448bea1bccf330021f0e
font_01_sfnt_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 10900 bytes
SHA-256: 749fe6060f52723d6065be35ff947e463455090fb2aeea544c4837d6e16edc6f

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