Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfc41ef8994ae74…

MALICIOUS

PDF

71.7 KB Created: 2021-01-09 17:07:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0755c0ef6f5d24cebde6c7caaa463f4a SHA-1: ecb01c0295269b7a7b80b7a5b7f5acde1ee15d77 SHA-256: 3cfc41ef8994ae745561512cd1e39f722433965c174791850b5332b6f1e7c390
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one heuristic specifically identifying it as a malicious redirector link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'cheat sheet' and application metadata, suggesting a lure document. The presence of numerous external PDF links points towards a campaign to drive traffic to potentially malicious or SEO-abused sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/aws?utm_term=cpr+2019+cheat+sheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377902/normal_5f8c459259f82.pdfIn PDF document text
    • https://zuxoviwizazuma.weebly.com/uploads/1/3/4/7/134737549/615237.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/149490.pdfIn PDF document text
    • https://pewukuma.weebly.com/uploads/1/3/4/7/134762228/zemedup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475586/normal_5fed743aac2cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_5fc1fae4038cf.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/d1a53f07-f44d-41f2-8a46-fbb57d81e21c/reguvoretipezobezanox.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/wondershare_filmora_9_free_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/gonusar.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/afcat_2_2018_gk.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/aqua_day_spa_massage.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/nubodobodoki.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_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 5376 bytes
SHA-256: 97e7aedc71beee5c75c58c8d78b8c85115f145c2e33cc79e4af7f57d237af68f
font_01_sfnt_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 10760 bytes
SHA-256: 4509601178412e8c78ede73bfcc31cd111fba10976e119ee5354693028ae2d90

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