Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07d6c433a14a0af…

MALICIOUS

PDF

47.1 KB Created: 2020-04-13 21:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f431dc1e4e7155fa18b0af104afea996 SHA-1: a0edc888e0bdb52fc9eb82e62cf1fcf51b9f9cbf SHA-256: f07d6c433a14a0afc2ef44991106934b41dcb7b90801024308b41fe85239fd27
94 Risk Score

Malware Insights

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

This PDF file is identified as malicious by an ML classifier and contains a large number of external links, characteristic of a link farm or SEO spam. The document body, though partially corrupted, suggests a lure related to 'Faringitis viral vs bacteriana pdf'. The primary function appears to be directing users to a network of other PDF documents hosted on various domains, likely for SEO manipulation or to host further malicious content.

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://muxialiu.com/uploads/1/3/0/7/130740623/130740623.html#faringitis+viral+vs+bacteriana+pdf
    • http://constructionminutie.com/uploads/1/3/0/8/130874049/mubuwujetoni-nuwovavepir-godezuwapawube.pdf
    • http://soletrain5k.com/uploads/1/3/0/8/130814728/8381620.pdf
    • http://raimelamb.com/uploads/1/3/0/6/130604687/ad57d13.pdf
    • http://ecosoccdiaspora.org/uploads/1/3/0/5/130589161/2740028.pdf
    • http://luisagarciahis5067.com/uploads/1/3/0/3/130323106/6294055.pdf
    • http://farmstofamiles.com/uploads/1/3/1/4/131438611/vimilerex.pdf
    • http://507claims.com/uploads/1/3/1/0/131070375/lugepigizuza.pdf
    • http://dreamslikeair.com/uploads/1/3/0/7/130776449/937f4c37.pdf
    • http://besticandib.com/uploads/1/3/0/4/130488940/vabonuraduj-variruwelaxe-gaxogabek-sabuwuwuwan.pdf
    • http://alphachiomegaofoaklandcounty.org/uploads/1/3/0/7/130775027/zopitavepur.pdf
    • http://phillydish.net/uploads/1/3/1/3/131398582/valusipenivuveb.pdf
    • http://alphachiomegaofoaklan
    • 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_off00008fb5.bin
ed4928e06fc1d30cfcb198ec78bf4cf4b13212c29c9c7185867ec0b8dcc6a86e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB5 8544 bytes

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