Malicious PDF — malware analysis report

Static analysis result for SHA-256 109c6e899f7cf109…

MALICIOUS

PDF

45.5 KB Created: 2020-04-13 14:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 882f60beefec11be2b42cb2387d5e12d SHA-1: 17fc44ce333320a3e6610d193c4e7e548caf523c SHA-256: 109c6e899f7cf1090d4d4093cd5ca7c5cae08b2a4c6b3eb620ab8062a70d3f52
156 Risk Score

Malware Insights

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

This PDF file is identified as a dropper by ClamAV and an ML classifier. It contains a large number of embedded external links, many of which point to other PDFs hosted on various domains, suggesting a link farm or redirection scheme. The primary function appears to be directing users to a network of SEO-optimized content, likely as a prelude to further malicious activity or to generate ad revenue through deceptive traffic.

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.
  • ClamAV: Pdf.Dropper.Agent-9158326-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9158326-0
  • 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://customelectrical.net/uploads/1/3/0/7/130739353/130739353.html#masa+molecular+agua+oxigenada
    • http://womenwalkingindestiny.com/uploads/1/3/0/8/130813757/aa6b9ff3633.pdf
    • http://callmarsh.com/uploads/1/3/1/4/131438460/wisof_bupivuluneve_korujinag_wenikisunatene.pdf
    • http://weltziensong.com/uploads/1/3/0/7/130738679/lopefaxemadifawepofe.pdf
    • http://wildwoodbiking.com/uploads/1/3/0/6/130620835/41da770ffbc.pdf
    • http://natalierupp.com/uploads/1/3/1/0/131070113/jasif.pdf
    • http://losangelespersonalstylists.com/uploads/1/3/0/6/130639443/vaximejiru.pdf
    • http://stoutenstorm.be/uploads/1/3/0/7/130739094/5479497.pdf
    • http://midatlanticdieseltorqueconverters.com/uploads/1/3/1/4/131452782/fopimisul.pdf
    • http://earthpotsllc.org/uploads/1/3/0/7/130776735/bc279.pdf
    • http://cordivanoapparel.com/uploads/1/3/0/4/130488920/rifoj.pdf
    • http://colbuiltconstruction.com/uploads/1/3/0/8/130814329/lemopadoxosubir-tunalamupidumof-rifizolupida.pdf
    • http://yawenfilm.com/uploads/1/3/0/8/130813604/6633530.pdf
    • http://roosthousingcoop.org/uploads/1/3/1/6/131637242/4622771.pdf
    • http://britishdesignassociation.org/uploads/1/3/0/6/130639837/tekatupogavosamu.pdf
    • http://lunarain.net/uploads/1/3/0/8/130874377/talaguxiwuvokezipid.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_off00007a6a.bin
18f8d1b4042ee225951c5a11c935e2231453a4776ce99892fff1527028f9cc77
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6A 10060 bytes
font_01_sfnt_off00009e68.bin
b99b579aa2cfe4cd90aa97114d8cc9c1bd781e29f1d1c4ff33c7a4c2644d81b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E68 2628 bytes