Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5915cd58561685…

MALICIOUS

PDF

57.7 KB Created: 2020-04-01 14:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 258bbbbee9c9b728a6bd87e9f10bae77 SHA-1: ca58f3e7b1c9f4437be95d4932a9bf17d080b155 SHA-256: ed5915cd58561685900e347fac2e16bd8eef4634792a0cfbf89684c29b451529
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique commonly used for SEO poisoning and distributing malicious content. The document body, though partially corrupted, suggests a lure related to 'Libros de quimica organica' (Organic Chemistry Books), aiming to trick users into clicking on the embedded links. The ML classifier strongly flagged this PDF as malicious, indicating a high probability 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://commandobrands.com/uploads/1/3/0/5/130588989/130588989.html#libros+de+quimica+organica+para+descargar+pdf
    • http://prcowosso.com/uploads/1/3/0/4/130476078/zuzukawesifag.pdf
    • http://stevesparke.com/uploads/1/3/0/3/130313619/2feb85ff3c1a.pdf
    • http://michelhairlicious.com/uploads/1/3/0/6/130603855/4760105.pdf
    • http://life-starcoaching.com/uploads/1/3/1/3/131380065/91ef4f5a1e353bc.pdf
    • http://njtanner.com/uploads/1/3/0/7/130775918/rujorupeva-jekobexupomo-luzefija.pdf
    • http://goldenphoenixwest.net/uploads/1/3/0/7/130739478/3581896.pdf
    • http://mermaidfitnessbump.com/uploads/1/3/0/7/130739991/bikinekimati.pdf
    • http://blaisentom.com/uploads/1/3/0/8/130813604/5398922.pdf
    • http://jbsplaques.com/uploads/1/3/0/4/130435873/towakoridonepiz.pdf
    • http://flagstaffsings.com/uploads/1/3/0/9/130969510/cef2cf37763b.pdf
    • http://lifeinhudsonyards.com/uploads/1/3/0/5/130590608/vodere.pdf
    • http://e-79investment.com/uploads/1/3/0/9/130969042/da0e283b0.pdf
    • http://craftisvistgathering.com/uploads/1/3/0/7/130739197/3216207.pdf
    • http://vancouverislandpremiumhardcandy.com/uploads/1/3/0/3/130323335/bumare-dasigalo-vagifu.pdf
    • http://alcottcove.com/uploads/1/3/0/6/130621024/sidinujoxi_zojerudopiwox_zujefi_zakakaxajofus.pdf
    • http://lubbockpestcontrol.net/uploads/1/3/0/3/130323612/2734099.pdf
    • http://cbacreditcard.com/uploads/1/3/0/2/130271190/tunifufama.pdf
    • http://leevanzylpsychicmedium.com/uploads/1/3/0/5/130551720/60949b82d.pdf
    • http://thefadeschool.com/uploads/1/3/0/4/130435784/68955e748f913.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_off0000b4df.bin
33f0e160a5b3c19e164c1a538973a2c3d7856eaa11bed1586f94f9c162e00972
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DF 9916 bytes