Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88568112d7f5179…

MALICIOUS

PDF

41.8 KB Created: 2020-03-29 10:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 5336a807d6e4aa98f8932412dbd13606 SHA-1: 4c3a3bdcfafaee544a2efa28c69d1545903d9cca SHA-256: c88568112d7f51793dc9c56245efe4b77ad3206cae676ad2d161fed4a12bc38a
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on different domains. This behavior is indicative of a link farm or SEO poisoning attack, designed to drive traffic to a network of sites. The document body itself contains garbled text and what appears to be metadata, but the primary malicious intent is derived from the extensive list of external URLs.

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://nuohotel-zh.devsite-1.com/uploads/1/3/0/5/130550985/130550985.html#como+hacer+un+folleto+paso+paso+como+se+hace+un+folleto+a+mano PDF link annotation
    • http://rootedcapitalmanagementgroup.com/uploads/1/3/0/2/130272511/4086787.pdfIn PDF document text
    • http://covetlash.com/uploads/1/3/0/7/130776223/tamatadapuzovojopo.pdfIn PDF document text
    • http://aegohealth.com/uploads/1/3/0/6/130620380/4544131.pdfIn PDF document text
    • http://www.lebowitz.org/uploads/1/3/0/4/130476736/4641692.pdfIn PDF document text
    • http://sacredcrystalhealers.com/uploads/1/3/0/7/130775889/11f7085f0f9.pdfIn PDF document text
    • http://thechrischapman.com/uploads/1/3/0/8/130813783/3761128.pdfIn PDF document text
    • http://www.dtmgt.com/uploads/1/3/0/6/130603741/90fe0b.pdfIn PDF document text
    • http://cookiedoughmagiccatering.com/uploads/1/3/0/5/130546391/lisobe.pdfIn PDF document text
    • http://elinetlouicius.com/uploads/1/3/0/3/130323417/tonimapejoz-dokukerowuvib.pdfIn PDF document text
    • http://ginasscrubs.com/uploads/1/3/0/3/130313649/90130.pdfIn PDF document text
    • http://kimbelliaboutique.com/uploads/1/3/1/0/131071047/tisobi_mozanuriwon.pdfIn PDF document text
    • http://reaidlab.com/uploads/1/3/0/5/130540046/416174.pdfIn PDF document text
    • http://mommylovesandrew.com/uploads/1/3/1/4/131409170/6ce69b2cc6d16d.pdfIn PDF document text
    • http://carrecoverylondon.org/uploads/1/3/0/2/130270746/xomiborifewu_rajemi_xifugofo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFF 8384 bytes
SHA-256: 96f1fdf0bb662dc4c1ffde56aea5c5c280ab0717cb6787fca46ed4ea7552c622
font_01_sfnt_off00008df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF4 2616 bytes
SHA-256: d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04

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