Malicious PDF — malware analysis report

Static analysis result for SHA-256 accbceb03af04904…

MALICIOUS

PDF

72.2 KB Created: 2020-04-19 07:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0eea4e7fe395678c337dbc8cd9d14d60 SHA-1: c3308412727efd03f51d6df7857bc7691ef3e549 SHA-256: accbceb03af0490424af7fedb70ae88eb77b24a5a4dbb1588186070a76535039
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to similarly structured URLs on different domains. The document body, though heavily obfuscated, contains the text 'Amtico form samples' and references 'wkhtmltopdf', suggesting a lure to a fake form or sample page. The primary attack pattern involves directing users to a network of linked websites, likely for SEO spam or to host malicious content. No scripts were extracted, limiting the analysis of direct payload delivery.

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://stratford-hvac.com/uploads/1/3/0/9/130969216/130969216.html#amtico+form+samples
    • http://lydiadolchconsulting.com/uploads/1/3/1/4/131409841/jemabepunenisovase.pdf
    • http://festivalindonesiaperth.com/uploads/1/3/1/3/131383933/2040370.pdf
    • http://schickbrasil.ch/uploads/1/3/0/3/130313230/ropalerigesekogap.pdf
    • http://templetonlymphedema.com/uploads/1/3/0/6/130604375/gedojobupoluxom.pdf
    • http://ibnpercy.com/uploads/1/3/0/8/130814032/6394791.pdf
    • http://octus.se/uploads/1/3/0/6/130621217/bifewepufuse_gubagemoxekomi.pdf
    • http://elitepathways.org/uploads/1/3/0/6/130639540/laxodajanubov_gavusuwodimiwe.pdf
    • http://sharpcreativeagency.com/uploads/1/3/0/6/130604699/e6c865a2da.pdf
    • http://unleashthefunatrudys.com/uploads/1/3/1/4/131407918/wozupowuvezuv-jimoxus-kafimazu-gimazazijonaz.pdf
    • http://ef-financial-service.com/uploads/1/3/0/2/130289663/sumorop.pdf
    • http://hearthtarot.com/uploads/1/3/1/4/131453053/runositiramagerejo.pdf
    • http://graciouscross.com/uploads/1/3/0/5/130542853/vonorerokitiwiwa.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_off0000f684.bin
932837b388f3c435ff8facd5ce914844c386cf576162eb60c98f6b3cd1427354		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 7708 bytes

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