Malicious PDF — malware analysis report

Static analysis result for SHA-256 68beb84062631cc3…

MALICIOUS

PDF

73.5 KB Created: 2020-03-13 08:15:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1f9e32316ebc07a1a7b683865aae64d7 SHA-1: c066a4070df3350d1cc066a6b4be531c051380ba SHA-256: 68beb84062631cc30f3b7859b70ac0c5a1df5545a9ae527ee040bdd15d4e6873
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains a URL that appears to be part of this scheme. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links is a common tactic for SEO poisoning or redirecting users to malicious 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://morris-auto.com/uploads/1/3/0/2/130287957/130287957.html#brucellosis+transmission+cycle
    • http://labradoodlesrus.com/uploads/1/3/0/5/130590561/4870526.pdf
    • http://www.legalgrins.com/uploads/1/3/0/7/130775690/8948741.pdf
    • http://www.kirkwoodeyeassociates.com/uploads/1/3/0/3/130379222/latutigafuneduv_pamega.pdf
    • http://www.peaktrusses.com/uploads/1/3/0/8/130874627/lolutowezapuxit-rizokeburatonip.pdf
    • http://joincarolynolson.com/uploads/1/3/0/6/130604487/vovogoreloxepuwimi.pdf
    • http://ilashhstudio.com/uploads/1/3/0/2/130272462/41d14.pdf
    • http://biking4life.org/uploads/1/3/0/6/130604226/3058109.pdf
    • http://mta-sts.vermunt.nl/uploads/1/3/0/6/130604322/xamopeminudegifoka.pdf
    • http://ackman4action.com/uploads/1/3/0/7/130776854/vozijozim.pdf
    • http://webdisk.adriancc.org/uploads/1/3/0/6/130621530/wadijog.pdf
    • http://www.richardvirtue.com/uploads/1/3/0/6/130604522/liwulufigi.pdf
    • http://antares.coronus.com/uploads/1/3/0/4/130435978/e316cb478f2da95.pdf
    • http://cuttingedgesebringfl.com/uploads/1/3/0/6/130605380/gimuzekuwajema.pdf
    • http://agenkastam.com/uploads/1/3/0/6/130639199/571d681.pdf
    • http://nebuchadnezar.com/uploads/1/3/0/5/130588492/01337b6cb59febf.pdf
    • http://winniplayhouse.org/uploads/1/3/0/4/130491008/zavile_lefureme_gogazojo_bejosekaze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac3.bin
277794ec9519d68d71926571a62cad1c936689c79417000874d70d4d776d89f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 9448 bytes
font_01_sfnt_off00010dbb.bin
4d9ec2aec8f1ca6bebe1b56492fd55a77bba3a6e98efb76508c1b835d4eb9912		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 2860 bytes

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