Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a8c82ce9ca2ff5…

MALICIOUS

PDF

44.1 KB Created: 2020-04-06 06:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 26de310401f43f35e9f39880512fb245 SHA-1: 06059c731aabcfd84868cd7272034abd422507ca SHA-256: 65a8c82ce9ca2ff512af61f8f5b93d170c17ce64dd7d6f850bfee86e472e1e84
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to other PDF files with numeric slugs, indicating a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest an attempt to redirect users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://charlesnicholswi.com/uploads/1/3/0/7/130775142/130775142.html#va+evidence+intake+center+janesville+wi+address
    • http://ethicalstone.com/uploads/1/3/0/6/130620979/kexarimopetu_devowav_desotuvadu_mazika.pdf
    • http://roottoshoot.ca/uploads/1/3/0/9/130969188/7003061.pdf
    • http://bfitandbfab.com/uploads/1/3/0/4/130476506/8011056.pdf
    • http://6032ogarajetsproposal.com/uploads/1/3/1/4/131452952/1789913.pdf
    • http://bluezoneplatform.com/uploads/1/3/0/7/130740596/wumufomijimerele.pdf
    • http://sisomartialarts.com/uploads/1/3/0/6/130604777/f5c350c4.pdf
    • http://heartsinhandchildevelopmentcenter.com/uploads/1/3/1/4/131453022/bigatamavu.pdf
    • http://outlateandgay.com/uploads/1/3/0/6/130620555/tupugotazogor.pdf
    • http://houseofblackart.com/uploads/1/3/0/8/130874039/wasiguzadexugux-vixejofolu-boneraliweluge-sewolesiz.pdf
    • http://yourwildwisdom.com/uploads/1/3/0/3/130323154/48ce02ef17.pdf
    • http://amritdaswani.com/uploads/1/3/0/8/130874240/9e3876a.pdf
    • http://1972mhs.ca/uploads/1/3/0/5/130543976/dutunulijuwubixepoka.pdf
    • http://thecakebyceci.com/uploads/1/3/0/6/130621575/gakixelatasukoxuxe.pdf
    • http://bwimidfieldaircargo.com/uploads/1/3/0/7/130739197/346996.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_off00007fec.bin
af92fa018213474930e32a9c304998820e0e2ab511f5afabea9e24de0612418f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEC 8724 bytes

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