Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae68638ac6df82a…

MALICIOUS

PDF

36.0 KB Created: 2020-04-04 12:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: af4fb4e7061329f07a302c81ffd7d976 SHA-1: 8d03c4f149dd54ba89976413b732d18ce42e1cc9 SHA-256: 5ae68638ac6df82a7ad2d8556ac6ecd0f7c84ec343c52733b5879b55b6e521c8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which point to other PDF files on unrelated domains, suggesting a link farm for SEO manipulation or to host malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links aligns with tactics used to distribute malware or phish for information. No scripts were extracted, but the primary attack vector appears to be directing users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://asociacionperiodistaspr.org/uploads/1/3/0/8/130874522/130874522.html#pintores+alemanes+del+romanticismo
    • http://cdconline.store/uploads/1/3/0/7/130776720/guwukigur.pdf
    • http://marietta-garage-door-repair.com/uploads/1/3/0/7/130776037/wabigufew_muvolifebukevad_nimatepe.pdf
    • http://englishwithlloyd.com/uploads/1/3/0/9/130969845/xasovizegisabu-darogosodigevi-tugosasifoj-ruxanogode.pdf
    • http://welcomehometoatmore.com/uploads/1/3/0/5/130550859/piweluzi.pdf
    • http://kidsphilharmonic.com/uploads/1/3/0/3/130324416/jofejagisifif-zofuribelizis-tuluxalakox-balenasonem.pdf
    • http://thefilterswap.com/uploads/1/3/0/4/130476866/zepubutaxikovosazor.pdf
    • http://nazga.org/uploads/1/3/0/6/130621857/gojaza-savobevu-zilixe.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_off0000641a.bin
3dc8bebf7fb8b588dbc39a8a69841ee99ab56ed938574efaea757da5b80d494c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x641A 8148 bytes

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