Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac4309fd49b2015…

MALICIOUS

PDF

37.7 KB Created: 2020-03-11 01:58:01 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 66c6ce2beb33ce0f8e4394b81a829f99 SHA-1: 57db835e01b52ade15b845aa68dd1a3efd5a513a SHA-256: 6ac4309fd49b20157229f069b97e6945ec269801c4d397918abaf5223fb658bd
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, a technique often used for SEO spam or to host malicious payloads. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links. While no scripts were extracted, the sheer volume of suspicious URLs suggests a high likelihood of malicious intent, possibly leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://26dwe.slpny.com/uploads/1/3/0/4/130435600/130435600.html#simplifying+expressions+with+negative+exponents+worksheet
    • http://domini-ct.org/uploads/1/3/0/5/130588343/ef07b.pdf
    • http://soulfeastco.com/uploads/1/3/0/4/130476083/zufujikogegu_titetibemuba.pdf
    • http://wholehealthdiscoverycenter.net/uploads/1/3/0/7/130740130/buvatogitojif-wamidavulevu-rujoxewo-juvufemitalodu.pdf
    • http://www.australianchartsreport.com/uploads/1/3/0/6/130604812/xixunoruse.pdf
    • http://www.brittc0llins.com/uploads/1/3/0/6/130639283/mexalege.pdf
    • http://icbrconference.com/uploads/1/3/0/4/130489475/rawesanojonu-rajowabugimol-lejedogubev.pdf
    • http://andrewwarnerdogtraining.com/uploads/1/3/0/4/130489075/f692abc02b350a.pdf
    • http://ghprn.com/uploads/1/3/0/2/130270990/2813637.pdf
    • http://freecoolmathgames.org/uploads/1/3/0/3/130323996/maxewejuri-mifiketid-velesularij-vugijikela.pdf
    • http://paneltechhomes.org/uploads/1/3/0/6/130621044/jenitomutomivu.pdf
    • http://cookietyme.com/uploads/1/3/0/6/130603684/9682040.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_off00006a7c.bin
21f94b7bb95f1d4407f79bf853c1edce2f4a91af347e5074477b298340984826		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7C 8080 bytes

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