Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b1b9139706796a…

MALICIOUS

PDF

44.6 KB Created: 2020-03-20 02:01:18 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 82d4fa96a475df7167571e6e2599d6a8 SHA-1: ccec871f0a7c2a2129665b496b0661917f0aad46 SHA-256: 63b1b9139706796aa0b7508d377558b57e98df2e20da7cd0c43cfe110fbc0a22
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially obfuscated, also contains URLs that appear to be part of this link farm. This suggests the primary purpose is to redirect users to a large number of external resources, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the sheer volume of links points to a coordinated effort to leverage external sites.

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://ccicommunications.com/uploads/1/3/0/7/130775590/130775590.html#ejemplo+carta+formal+para+solicitar+beca
    • http://bodycarebytara.com/uploads/1/3/0/6/130639140/8025363.pdf
    • http://burtonhillfarm.com/uploads/1/3/0/5/130590163/wobakagegujano.pdf
    • http://link3technologies.net/uploads/1/3/1/0/131071240/20378bcf1a6be.pdf
    • http://www.rhinebernardino.net/uploads/1/3/0/2/130272271/timikesawuxoleguj.pdf
    • http://mx.studydominica.com/uploads/1/3/0/9/130969647/3541391.pdf
    • http://www.insurancesolutionsofca.com/uploads/1/3/0/2/130272295/9871146.pdf
    • http://havencoachingconsulting.com/uploads/1/3/0/7/130775639/werokujujowike-lerarizibiki-mazuzepute-xomadasesabuxu.pdf
    • http://goodnightmooncamping.net/uploads/1/3/0/7/130775746/a70a9616d9c7b.pdf
    • http://stepupyourseo.com/uploads/1/3/0/7/130739063/6224734.pdf
    • http://wrenchmechanic.com/uploads/1/3/0/7/130740019/riguzaka.pdf
    • http://www.hobbylobby.online/uploads/1/3/0/8/130873718/d098510.pdf
    • http://maisons-de-vacances-finistere.fr/uploads/1/3/0/6/130639746/takenir-zobamowowa.pdf
    • http://peterhaas.net/uploads/1/3/0/5/130590195/kiwekinovij-rolagijulojejed-somoxeni-wuramonowege.pdf
    • http://fooback.org/uploads/1/3/0/6/130622049/be4e41c34840145.pdf
    • http://combatrescueexperience.com/uploads/1/3/0/7/130738741/nemitiriwu.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_off000080dd.bin
f37ea4a8bdce9639f860734d70aa1711719beeb3406b328df11b13de7c9ed4e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80DD 9584 bytes

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