Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa0a3038d9e4159…

MALICIOUS

PDF

23.2 KB Created: 2020-05-29 02:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfc177a245491e1de67f91a8666c2161 SHA-1: 35cf5ac61135799cf0c085ca69e61452663950e6 SHA-256: caa0a3038d9e41592f73d48126546d3f8865a12c431b1932260f64e903a782b8
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF is identified as an image-only lure, typical of phishing campaigns. It contains numerous external links to other PDFs hosted on various domains, suggesting a link farm designed to obscure the ultimate destination or spread malicious content across multiple sites. The ML classifier strongly indicates maliciousness, and the PDF structure points towards a user execution attack pattern via a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 23 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://inspiredlifeescapes.com/uploads/1/3/0/5/130588603/130588603.html#100+mb+pdf
    • http://minakayyalieventplanning.com/uploads/1/3/0/9/130969621/07563b75183ae33.pdf
    • http://ns1.sunnymeadowscages.com/uploads/1/3/0/2/130272271/pogunatipilefan.pdf
    • http://vetbeddingman.shop/uploads/1/3/0/4/130436122/3898623.pdf
    • http://cwdesigncenter.com/uploads/1/3/0/2/130272928/fc7219bb5.pdf
    • http://serenity-mechanical.com/uploads/1/3/0/5/130551564/furelifelovulujojife.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003a74.bin
dce9b90dd91bd05ff7243a63c768141df67a65c3d35d582d5ddcfe8884f55fbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3A74 7112 bytes

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