Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fe543058ed600c…

MALICIOUS

PDF

113.8 KB Created: 2021-01-06 15:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c5ebca20b0794094e5773a12888015e SHA-1: f1c9cecbc474bc6ca33bc578c975ec653fa6e701 SHA-256: 13fe543058ed600c4854921af71afe4a580b4191a4e4efd366ad9fea987dfb92
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure or are part of a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish or redirect users to malicious sites. No scripts were extracted, but the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gettraff.ru/123?utm_term=herzog+et+de+meuron+rue+des+suisses+archdaily
    • https://cdn.sqhk.co/nuwobevina/2ghmVgg/64813038873.pdf
    • https://mefogogid.weebly.com/uploads/1/3/4/6/134600117/kagogolapezomi.pdf
    • https://cdn.sqhk.co/lixozimiz/Wgciaia/murem.pdf
    • https://cdn.sqhk.co/giganopof/hjjjhcH/debudewidixunoti.pdf
    • https://cdn.sqhk.co/nejajevafode/1Cz0xeu/wirex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f1b81a92-3a1e-4446-a402-b42533a16f46/verbs_that_start_with_letter_v.pdf
    • https://uploads.strikinglycdn.com/files/f91ec5ed-5f59-416d-966f-d498b7754088/skeleton_waiting_for_approval_meme.pdf
    • https://uploads.strikinglycdn.com/files/785fd17c-d90a-457f-a0d0-d8a6975a31aa/2522404216.pdf
    • https://uploads.strikinglycdn.com/files/f19db431-1393-43de-b421-6f4a9ccbd249/98298751380.pdf
    • https://s3.amazonaws.com/fizaxo/business_plans_in_nigeria.pdf
    • https://s3.amazonaws.com/goviwigax/advanced_excel_2017_tutorial_free.pdf
    • https://uploads.strikinglycdn.com/files/99f4c5c1-cc03-4b8e-a500-1bc6c375d1a4/jepibivexawi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015a7f.bin
16be5d75904e8fbb37306195101a96456142b7bee7a863910f595945cf47614d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A7F 5464 bytes
font_01_sfnt_off00016cf6.bin
7a6c0cc2e8e0c0e7e4f20de5cf3a6120aa49613d38334657b02bfecc5d3d5eb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16CF6 2404 bytes
font_02_sfnt_off0001767d.bin
d628a098cc4c181c1fdf95a5537181807aeca504d4dc39beeef7b35e7f705e13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1767D 13792 bytes
font_03_sfnt_off0001a15f.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A15F 16204 bytes

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