Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ff14ea36499f85…

MALICIOUS

PDF

30.0 KB Created: 2020-04-30 02:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 581543ffc06f3ee621d8d8e39744e6e9 SHA-1: 1a0a3841bd0f1ffe8274f3ff18585988b370539a SHA-256: 12ff14ea36499f85b1695cee55bff06d9be2a77a16dd061fa2bc7d9d0a55ef3f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious sites. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious activity, likely serving as a lure or a distribution point for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sauerlandhypotheek.nl/uploads/1/3/0/7/130775659/130775659.html#batch+production+pdf
    • http://theskinpa.com/uploads/1/3/0/8/130813786/zigolijasalavobo.pdf
    • http://wjbdependablelegalservice.com/uploads/1/3/0/7/130740456/rekenusuteguf_kimekifepo_goxuxisim_figud.pdf
    • http://annethielen.nl/uploads/1/3/0/5/130546183/surutoguxenadas.pdf
    • http://illustratie57.com/uploads/1/3/1/3/131384025/widufo_fikalajus_jenexurebupiw.pdf
    • http://michellewhyman.com/uploads/1/3/1/4/131406438/pileleda-pesudutabi.pdf
    • http://therealsolutionsllc.com/uploads/1/3/0/3/130313323/jabulebuvu.pdf
    • http://shadowsnetworkcod4.com/uploads/1/3/1/4/131437742/591f4b.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_off00005148.bin
55634e68d52ffc6c6e6fcb800f81b728697123ffc207406109bfcf00a69c63df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5148 6940 bytes

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