Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27128bda23f727a…

MALICIOUS

PDF

67.0 KB Created: 2020-11-19 19:01:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f53e1ce3e1c3f1236f6695890c7e0da0 SHA-1: 5ca98c8fd3a7862f2fed73e43d8fc57f4e60e3b8 SHA-256: b27128bda23f727ab9d21e23e9ed0beb3e1bac51d168f321e9d8f16a21539935
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, identified as a link farm, and one link points to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or malicious redirection attempt. No scripts were extracted, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=crepe+satin+textile
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/tisujekivekuv.pdf
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/simefaruw.pdf
    • https://cdn-cms.f-static.net/uploads/4450240/normal_5fadac26e7e6a.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/dekegu.pdf
    • https://rosikotukixaru.weebly.com/uploads/1/3/4/3/134312973/7657551827b640.pdf
    • https://sewobefavewekog.weebly.com/uploads/1/3/4/3/134367647/89e9f6713538358.pdf
    • https://furewerojerekez.weebly.com/uploads/1/3/4/3/134370242/xugozogogij-lolitexixujami-funinazarul-jarizaja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a83ac093-48c5-46ca-b17f-2675b54750f2/pijage.pdf
    • https://uploads.strikinglycdn.com/files/7d491484-a76d-4c8c-a3a3-8718527ddd83/wow_classic_1-60_warrior_leveling_guide.pdf
    • https://uploads.strikinglycdn.com/files/1b1b937a-5f96-41cb-a473-13ba1a8395a3/81889724002.pdf
    • https://uploads.strikinglycdn.com/files/67532d77-8e5b-4bad-9c03-d383f3839126/43859434223.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c728.bin
e51f1fef14757ed51314addbb99464612f098d5b49707df970ebcc57ee64741c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC728 4784 bytes
font_01_sfnt_off0000d77c.bin
28dd05ea1aa8fc7d1430ab77297873ba111235904704c0dbdfdb0d1877b91da6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 12284 bytes