Malicious PDF — malware analysis report

Static analysis result for SHA-256 74324508fce783ec…

MALICIOUS

PDF

48.3 KB Created: 2020-03-23 13:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 81a6419fdf52fffbe3141c55e6d7aa46 SHA-1: 6cd2d14823f7ece1cb131c922f373f04e9cf195b SHA-256: 74324508fce783ec8baf56602ac2f7ca1540b4722f016fda01ac173d43956758
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. These links point to various PDF files hosted on unrelated domains, suggesting a tactic to manipulate search engine results or distribute malicious payloads. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of external links indicates a high likelihood of malicious intent, possibly related to SEO spam or a link distribution scheme.

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://sensitiveminds.org/uploads/1/3/0/4/130483428/130483428.html#tesis+marco+teorico+pdf
    • http://mta-sts.mx.pescaturismotarifa.com/uploads/1/3/0/7/130738801/f02e5cc3be5.pdf
    • http://webdisk.electeckhoff.com/uploads/1/3/0/5/130540507/xesusemiladikatoma.pdf
    • http://miracleproductionstc.com/uploads/1/3/0/8/130814057/dec66903.pdf
    • http://centuryspringspark.com/uploads/1/3/0/4/130490078/kuvakapaj_lokajowid.pdf
    • http://en.laurentpoliquin.org/uploads/1/3/0/5/130588277/8a8c11e1.pdf
    • http://www.coachsmith.net/uploads/1/3/0/2/130271103/mavomebo.pdf
    • http://glassfestivalen.se/uploads/1/3/0/3/130324278/652319.pdf
    • http://greenyourstyle.com/uploads/1/3/0/4/130483457/fbfa882e9304f.pdf
    • http://www.honeysplace.org/uploads/1/3/0/5/130588599/winusopuruzi.pdf
    • http://akashicrecordproductions.com/uploads/1/3/0/4/130477003/jaxireduronaki.pdf
    • http://butlien.net/uploads/1/3/0/8/130874007/rijizegumu.pdf
    • http://dekorartis.com/uploads/1/3/0/6/130605230/zemalunosezap.pdf
    • http://admarcsouthwest.com/uploads/1/3/0/6/130621331/lepiwin.pdf
    • http://phfoweraker.com/uploads/1/3/0/7/130775715/7974907.pdf
    • http://cutsiechic.com/uploads/1/3/0/2/130287915/pologaj-vewokaloxuwa-wozevepux.pdf
    • http://mta-sts.rozowawstazeczka.com.pl/uploads/1/3/0/7/130775209/acd2a801.pdf
    • http://dillingerandco.com/uploads/1/3/0/6/130621467/wekiragojepik.pdf
    • http://noblehelix.com/uploads/1/3/0/5/130539348/7e5469d657ed.pdf
    • http://www.lux-df.com/uploads/1/3/0/5/130589020/7377924.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_off0000919e.bin
d31c45eaa7c7f0d3298b58fecc98d0170d799f69e4c5a6c885f54be8f42c491b
pdf-font-stream PDF embedded font (sfnt) at offset 0x919E 9172 bytes