Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf815d2086d53d32…

MALICIOUS

PDF

74.9 KB Created: 2021-01-11 11:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dc60f772bed39763d1c8e01127cb2872 SHA-1: 9892bab967308a0713261f03ff86f8397670081c SHA-256: bf815d2086d53d32201af66a6c25df3932009eb0b1a0e76e9d32a70fe58c557e
244 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ClamAV and an ML classifier, and it contains a large number of embedded links. Several heuristics indicate that this PDF functions as a link farm, with many URLs pointing to disposable hosting services. One critical heuristic specifically flagged a link to known malicious redirector infrastructure. While no scripts were extracted, the primary attack pattern appears to be SEO spamming and redirection to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=tank%20stars%20pour%20pc In PDF document text
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/tipivil.pdfIn PDF document text
    • https://didunoduwogu.weebly.com/uploads/1/3/2/6/132682107/3778239.pdfIn PDF document text
    • https://vesasasafej.weebly.com/uploads/1/3/4/7/134758359/1968780.pdfIn PDF document text
    • https://site-1176551.mozfiles.com/files/1176551/diwudolarepizasusal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451760/normal_5fc311229e16e.pdfIn PDF document text
    • https://site-1171628.mozfiles.com/files/1171628/xumiliforolur.pdfIn PDF document text
    • https://site-1217578.mozfiles.com/files/1217578/jodoluson.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446275/normal_5fe62a5d6b52f.pdfIn PDF document text
    • https://site-1174026.mozfiles.com/files/1174026/superstar_life_mod_apk_android_1.pdfIn PDF document text
    • https://jugoruzaja.weebly.com/uploads/1/3/1/4/131407370/c25b222f.pdfIn PDF document text
    • https://vewagabijepafin.weebly.com/uploads/1/3/5/3/135348553/3410167.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fejififimaketo/wotinokura.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 4624 bytes
SHA-256: 167d6510b14c5ddc60437216912b81994bced7501d1f270a12ec02766b0e108c
font_01_sfnt_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 10668 bytes
SHA-256: 8c612286297436eb59dbfa73ac2d16e1e429cf41fab24c73b02098649ab02786
font_02_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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