Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a0b163bf0421fb…

MALICIOUS

PDF

103.5 KB Created: 2020-11-28 09:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7580fd935c978df630d33f3d0094c19 SHA-1: 1f07f61c1d81ac0ffd9bdf679236e67a5f1fc28f SHA-256: b0a0b163bf0421fbbacaa4f411f3d9528c8035cbc83ad6fb7e62f94d478f242f
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on link farm domains, indicating a phishing or malware distribution attempt. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious redirector infrastructure. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/aws?utm_term=bell+fibe+tv+guide+pdf
    • https://zosagejezigim.weebly.com/uploads/1/3/4/7/134709887/7fbaf.pdf
    • https://cdn-cms.f-static.net/uploads/4388162/normal_5f8f55159f578.pdf
    • https://debovibeki.weebly.com/uploads/1/3/4/7/134715081/3353395.pdf
    • https://cdn-cms.f-static.net/uploads/4374715/normal_5f8bfa73d6a64.pdf
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/tetezipefenig_lugato_zizilet_zexowedokupepib.pdf
    • https://cdn-cms.f-static.net/uploads/4368219/normal_5fbec91beadd0.pdf
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/5ef4e599e667.pdf
    • https://cdn-cms.f-static.net/uploads/4446147/normal_5f9f3cdc53a67.pdf
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5f89267b7cb0f.pdf
    • https://cdn-cms.f-static.net/uploads/4403820/normal_5f93159478048.pdf
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5fbf5bf7a4349.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sebunuzu/is_apkpure_website_safe.pdf
    • https://uploads.strikinglycdn.com/files/8c736dcf-e20a-411a-ad41-c07077a850a3/7263340558.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015edf.bin
e31bc4beffc399786c6ed2416133eb303dff310b4b6f705b9c651175f661bc25		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15EDF 28352 bytes
font_00_sfnt_off000126b0.bin
414a5a29d88165dcd7428aa74bb7063381522f7e00d865d4f50e7392e6a31415		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126B0 4972 bytes
font_01_sfnt_off000137c0.bin
0f67e93a0d63512114250cf4fdb0c8a8d6c07f6d2253e85746c94f25cf2cbc44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137C0 12388 bytes

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