Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b0f98126ba73b6…

MALICIOUS

PDF

77.4 KB Created: 2020-11-26 01:10:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bcded22afcede0fe825576bc7470ef79 SHA-1: 109f8be17d249974f578ee8092769b97c15157e4 SHA-256: f0b0f98126ba73b69f831aa9a5c2a7bf82c74edff3ffbef0cdde6da57bd9a4d8
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to external PDF files, creating a link farm. One prominent URL, 'https://gettraff.ru/strik?utm_term=gnc+testosterone+booster+estrogen+blocker', is identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?utm_term=gnc+testosterone+booster+estrogen+blocker In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_5fa7d1a5976f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_5faa708524c5d.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/jajixakopokeru-zebosaw-xosevuzid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f8768a244aa1.pdfIn PDF document text
    • https://kufofena.weebly.com/uploads/1/3/4/5/134504524/zagelukefolavib.pdfIn PDF document text
    • https://malinozibide.weebly.com/uploads/1/3/4/3/134380659/e93f0f2.pdfIn PDF document text
    • https://nulosogitizibe.weebly.com/uploads/1/3/4/3/134317173/6608209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466679/normal_5fa2d9601ac93.pdfIn PDF document text
    • https://nipefewemaxu.weebly.com/uploads/1/3/4/3/134387654/dizopumuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491688/normal_5fbb2b7493046.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/pivetuzadujo/25980621738.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/pathfinder_create_spiked_pit.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/solixosufotonikekelasono.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/meriwofarirevonibejew.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_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 4992 bytes
SHA-256: 0a0e40d7e1ce154f0c98b320b241f026f03680e282ebc8156f058cea3557e310
font_01_sfnt_off0001028c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028C 11256 bytes
SHA-256: 26869ba57f28ffcbccc1e7120fdc4cab234a3fc5e9a7cd670260cd1fcbe62451

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