Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa5ef53eca813e9…

MALICIOUS

PDF

32.2 KB Created: 2020-06-13 14:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 985a79e768af1ab928cdfd2d07369947 SHA-1: b9802d8c387794dc2531f6867459142544111470 SHA-256: 0aa5ef53eca813e976970f866936b31b36c5aff5e4a5d469cf8b6dfb8ecf3702
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 SEO manipulation tactic. The embedded document body text and one of the extracted URLs, 'http://powerdiscoverycoach.com/uploads/1/3/0/5/130588289/130588289.html#arap%25C3%25A7a+s%25C3%25B6zl%25C3%25BCk+indir+bedava', indicate a lure for free dictionary downloads. While no scripts were explicitly extracted, the nature of the PDF and the numerous external links suggest it's designed to drive traffic or host malicious payloads, aligning with a spearphishing attachment initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://powerdiscoverycoach.com/uploads/1/3/0/5/130588289/130588289.html#arap%25C3%25A7a+s%25C3%25B6zl%25C3%25BCk+indir+bedava
    • http://jacobusrestaurant.nl/uploads/1/3/0/8/130874591/fewuxowewi.pdf
    • http://lifeonpurposeinc.com/uploads/1/3/0/4/130436162/mikofifiga.pdf
    • http://thecabininbigbear.com/uploads/1/3/1/4/131452886/1e6b4bc82843.pdf
    • http://gerardleen.com/uploads/1/3/0/9/130969525/voxibux_gewazukiwup_girawuxabifik.pdf
    • http://the-beauty-bar-store.com/uploads/1/3/1/6/131637150/paninaf.pdf
    • http://living-twenty.com/uploads/1/3/0/3/130313319/4849509.pdf
    • http://deutsh.travelmittelamerika.com/uploads/1/3/0/6/130639869/9663244.pdf
    • http://simpleprise.com/uploads/1/3/0/7/130776536/tupobeditejomoma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bisapabak.files.wordpress.com/2020/06/suzuti.pdf
    • https://kisodexogibi.files.wordpress.com/2020/06/losorinorojirogisavu.pdf
    • https://wutosilupuw.files.wordpress.com/2020/06/venavodunone.pdf
    • https://kemetax.files.wordpress.com/2020/06/19983208538.pdf
    • https://kidubivo.files.wordpress.com/2020/06/jeruzu.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000505c.bin
5572829d598b9b8cc9c173a70a0abe4ba375f6c8ae78e4d2a2ca39ae65842854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x505C 11032 bytes

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