Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c5d16d1eb5e831…

MALICIOUS

PDF

37.7 KB Created: 2020-03-20 08:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 23feacfba4b505e0c4b6dc9cf2206228 SHA-1: 0f86d50548349d850fa3a9f29788ec4b722f64b4 SHA-256: d7c5d16d1eb5e8316b5d0a822f28e10cf459d2b71db36320354e83dc0bc065f0
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the observed link farm behavior. No scripts were extracted, and the document body is largely unreadable binary data, but the presence of numerous external URLs is the primary indicator of malicious intent.

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://remodeling96.com/uploads/1/3/0/4/130476589/130476589.html#guia+cte+primera+sesion+ordinaria+2018
    • http://babacoolpc.com/uploads/1/3/0/6/130639268/8974427.pdf
    • http://fbiloveyou.xyz/uploads/1/3/0/4/130489090/ramoka.pdf
    • http://motionautodetailing.net/uploads/1/3/0/6/130622059/merejarizivudud.pdf
    • http://newenglandpowerlight.com/uploads/1/3/0/4/130477613/visopejajag.pdf
    • http://leilaamani.com/uploads/1/3/0/9/130969680/wekonulajideti-wabaruwurifal.pdf
    • http://rallynational.info/uploads/1/3/0/7/130775331/1846328.pdf
    • http://www.fearnlondon.co.uk/uploads/1/3/0/8/130813835/witawatijamov-xorukatiw.pdf
    • http://martzoukos.gr/uploads/1/3/0/6/130639463/mibizazepaxin_vosogoware.pdf
    • http://saharaexchange.com/uploads/1/3/0/7/130774966/6265504.pdf
    • http://www.lucaslocksmithservice.com/uploads/1/3/0/5/130588499/vigiwasum-dopupalo.pdf
    • http://www.fsinvestments.org/uploads/1/3/0/4/130435881/begovi-redobozosed-pator-bibibexesamu.pdf
    • http://www.columbuspetmagazine.com/uploads/1/3/0/7/130740141/eec106ce.pdf
    • http://rivertoriverparanormal.com/uploads/1/3/0/3/130323707/tadifaxok_kifavekiwudogok_bifopujusawebat.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_off00006b04.bin
23dd674101cd55e00dc56e4f8bd4815b8cd3ee4f977354731f3c82e2c9861795		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B04 8296 bytes

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