Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e6de4a2e6a5941…

MALICIOUS

PDF

38.9 KB Created: 2020-03-11 05:07:49 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 26cd0fa7dfc45bcd3d3cdcc563c1d941 SHA-1: c53b1459d586a9b36a0c8b112773f11fa5178ecb SHA-256: 59e6de4a2e6a5941d0ba7bc52ba5ddb988441d86c0eff15faea7fe4fd94d89c9
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This pattern is indicative of a link farm or a mechanism to distribute malicious content indirectly. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is designed for malicious purposes, likely related to SEO manipulation or hosting further stages of an attack. No scripts were extracted, and the document body text is largely unreadable, but the heuristic firings and numerous URLs are sufficient evidence.

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://houseforsalellc.com/uploads/1/3/1/0/131070314/131070314.html#examples+of+active+voice+and+passive+voice+in+past+tense
    • http://xolhemetsociety.org/uploads/1/3/0/9/130969931/jimig.pdf
    • http://unitethevillage.org/uploads/1/3/0/7/130739564/fb150.pdf
    • http://cpanel.farobankcreative.com/uploads/1/3/0/4/130436339/luperaxomi.pdf
    • http://southernfrequencies.com/uploads/1/3/0/9/130969915/67eb6aa7add1656.pdf
    • http://asiaticsports.com/uploads/1/3/0/8/130813427/mivakonamozukidufoxa.pdf
    • http://www.bevopainting.com/uploads/1/3/0/4/130435670/1720d258baaa5d7.pdf
    • http://santeeautodetail.com/uploads/1/3/0/4/130475964/22563.pdf
    • http://shoresidesports.com/uploads/1/3/0/6/130604445/dakezidasase.pdf
    • http://www.youreverydayassistant.com/uploads/1/3/0/2/130271076/tudow.pdf
    • http://info.enneavision.nl/uploads/1/3/0/8/130874026/kakejexi-selovijizuw.pdf
    • http://asc-it.at/uploads/1/3/0/2/130288864/febaliv.pdf
    • http://drbrettagrant.com/uploads/1/3/0/4/130488569/ruluj-relumewituwu-juxavosikoxaz-laxetof.pdf
    • http://www.lucanina.com/uploads/1/3/0/7/130776872/bibomevozosuvez-kepapodaga-turajipat-fizufariwido.pdf
    • http://www.rbcdublin.org/uploads/1/3/0/4/130435646/zilemeko.pdf
    • http://ohsosouthernhandcrafteddesigns.com/uploads/1/3/0/7/130775378/cc26ad2e1f7bd1.pdf
    • http://a2ndlook.shop/uploads/1/3/0/2/130271207/kekan-rudik-nidiv-fedono.pdf
    • http://www.kamafitness.org/uploads/1/3/0/2/130273576/9632209.pdf
    • http://decuatrohojas.net/uploads/1/3/0/4/130483384/a51f3b5ccdf.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_off00006d80.bin
e9719d087a717b632bed9b5dfb92763715ad2667ab4e3b58f300168f1a579778
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D80 8460 bytes