Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84ba8600aca1977…

MALICIOUS

PDF

94.1 KB Created: 2020-11-17 08:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb8feec442cb7425360fadbe07d2b668 SHA-1: 79f3e7549c7ec087feacd5f161e455a619a0f1db SHA-256: a84ba8600aca1977f9cd795fefaf7cf624a3964b27b762373bd88ede9719fd0a
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to external resources that appear to be part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=antman+and+wasp+ending
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/bisikepuro_lerezet.pdf
    • https://cdn-cms.f-static.net/uploads/4375891/normal_5f9a146398802.pdf
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/5565eace7a.pdf
    • https://bopiwode.weebly.com/uploads/1/3/4/3/134367631/podutenumazek.pdf
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5fa46f56e5976.pdf
    • https://cdn-cms.f-static.net/uploads/4371791/normal_5f8cc77325ee6.pdf
    • https://cdn-cms.f-static.net/uploads/4449421/normal_5fa267abe27c8.pdf
    • https://cdn-cms.f-static.net/uploads/4405654/normal_5f96915de6241.pdf
    • https://cdn-cms.f-static.net/uploads/4414174/normal_5f9ef013ea64a.pdf
    • https://cdn-cms.f-static.net/uploads/4404299/normal_5f9fb408975ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/75940b72-2d0f-4c3f-9c3b-b4e290c06066/rabek.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011056.bin
ede077bcf9d936b2deabd1ca36e5cf164b77d75f1467ec74ab7a8d43bb048d6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 2856 bytes
font_01_sfnt_off00011a81.bin
1175cdb70c2830c2688bebcb23c6a6313d3b9dc852c84adc6d73a850223f0176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A81 4912 bytes
font_02_sfnt_off00012b27.bin
0bd9caa184ecf73a266422ca9ff7b8859ba42050b6aeeb96f1d013992fde6d65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B27 16204 bytes
font_03_sfnt_off00015cfe.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CFE 4324 bytes

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