Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc107b71521d348b…

MALICIOUS

PDF

60.0 KB Created: 2020-04-08 03:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 295b2b404f50bf59e7e9482c62f1f432 SHA-1: 292519ab8c310b0fac68815ba1dc2c3803161afb SHA-256: fc107b71521d348b07fc6229458b483fb9236ee3b3da225a597070304d00f330
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The embedded document body text, though partially corrupted, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document. The primary attack pattern involves redirecting users to these external URLs, which are likely hosting malicious content or phishing pages.

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://distancelearningtoday.net/uploads/1/3/0/5/130541677/130541677.html#cuento+las+babas+del+diablo+analisis
    • http://rexlease.nl/uploads/1/3/0/6/130639138/mobenixukiw_zukelup_panopojixedafe.pdf
    • http://arthouseworks.com/uploads/1/3/0/4/130483428/1616631.pdf
    • http://deadpointfilm.com/uploads/1/3/0/8/130873838/4751272.pdf
    • http://milkstrategic.com/uploads/1/3/0/7/130775987/zizusaxujede-xixevidelavire-gokekofev-keximori.pdf
    • http://krypto-hilfe.com/uploads/1/3/0/9/130969419/dubijituk_kinumeganawav_ninarukek_zuriragineko.pdf
    • http://sendemfrankie.com/uploads/1/3/0/5/130588747/9151750.pdf
    • http://madeinmendocino.net/uploads/1/3/0/6/130639762/xusimep_tasib.pdf
    • http://ramundobeauty.com/uploads/1/3/1/4/131437242/e1f9d2fe3.pdf
    • http://yakwelicosmeticsandmakeup.com/uploads/1/3/0/6/130604955/2099502.pdf
    • http://aiharah.com/uploads/1/3/0/6/130639348/aef445bb461c0d.pdf
    • http://huntcountyjobs.com/uploads/1/3/0/2/130291416/bojijidasoda.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_off0000c2c7.bin
ba7fdd041516fdc4b0ab470c8b22fd37207d9fd520284ace80c7f72254d58e58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C7 8876 bytes

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