Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5bd988cef287cd…

MALICIOUS

PDF

66.0 KB Created: 2020-12-21 00:52:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e1ef7459ca3cdc2cc37403748a7bd5b SHA-1: 75867a6e0ee5cb4570cbe228e51d08b4a99a9b3b SHA-256: ca5bd988cef287cd0ab0221ac49b16f9a1783bcb8d6e1e1e71c13a227b2e3881
156 Risk Score

Malware Insights

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

The PDF file contains a lure related to 'Bollywood songs collection zip file download' and embeds a large number of external links, many pointing to other PDF files. This behavior is indicative of a link farm or phishing attempt designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/strik?utm_term=bollywood+songs+collection+zip+file+download+2018+pagalworld
    • https://cdn-cms.f-static.net/uploads/4417983/normal_5f9ac0b35508b.pdf
    • https://cdn-cms.f-static.net/uploads/4416151/normal_5fd652497f6e6.pdf
    • https://soregoba.weebly.com/uploads/1/3/0/7/130739918/rorusutexo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jasadavebaga/ludosugiribozipunovid.pdf
    • https://uploads.strikinglycdn.com/files/e6d0674d-ed8d-4fce-bb64-fdd0100b9dd2/sosipubapokazemizizekedat.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf48f35147b1480429261f/1606371572452/gadoxanobujisarofopive.pdf
    • https://s3.amazonaws.com/sisaxu/gonubabubivipoleze.pdf
    • https://uploads.strikinglycdn.com/files/dccb7be9-398a-4f55-8444-fd3487a4a2eb/jazajomagixotad.pdf
    • https://uploads.strikinglycdn.com/files/39e29583-4aa1-46e8-b63f-9fe3f40c9a3d/gabaf.pdf
    • https://uploads.strikinglycdn.com/files/69028667-c2be-49c6-9536-d1f118e32138/download_icq_christmas_cards.pdf
    • https://s3.amazonaws.com/subud/654184924.pdf
    • https://s3.amazonaws.com/jajuzasalikirut/bivomonefunu.pdf
    • https://uploads.strikinglycdn.com/files/19f7c14c-9256-4d77-bff5-63bc20d8526c/puxulubelogaridemulaxog.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_off0000c063.bin
a3c4b242215a37dc7a8bcfd9bd10149831119e7388f0f5a6df746ee13332f4d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC063 6136 bytes
font_01_sfnt_off0000d582.bin
59f0725c839f5d8dd616b0482bc77286d5feeeb9feb0bb179ce0fd854093323e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD582 11448 bytes