Malicious PDF — malware analysis report

Static analysis result for SHA-256 855c8c55e1d8a158…

MALICIOUS

PDF

69.1 KB Created: 2020-11-21 06:16:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 61a510ca6c422b869c7ebfd122faf7e6 SHA-1: 4239e52143230646cee69c975ce54ff757212850 SHA-256: 855c8c55e1d8a1580be43403b4b4f2479990923ca4f27c0d82743373da538c3a
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search results or distribute content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

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://ggtraff.ru/123?utm_term=legally+blonde+3+2020+release+date+uk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_5f997e6501313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_5fa46010caa19.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/baf16012dcf2584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468814/normal_5fafd3d57c614.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/wunupalezozerud/past_tense_form_of_choose.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/86008475778.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/super_snap_speedway_deluxe_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/miziniwodi.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/favubutifonarefofizibux.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/paypal_money_adder_aop.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/26807005515.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_off0000cd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD10 5680 bytes
SHA-256: 1b84ffdf5c97c1dcc1b54a305717e8556f5dc1a17762b9f2dd59a4883ad3b93b
font_01_sfnt_off0000e073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE073 11640 bytes
SHA-256: f0a15af928701b389ab916ad7cb0f82c2c40ed5f4cadba38f0a054ff55e504b8

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