Malicious PDF — malware analysis report

Static analysis result for SHA-256 717de6599eaae25d…

MALICIOUS

PDF

36.8 KB Created: 2020-03-19 03:22:57 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 960c4f219e9b5073f9931d148f5b51e0 SHA-1: f41b2133b2c8812cffd7091637219b304eba86f3 SHA-256: 717de6599eaae25ddff51bf34be03ebfdf9d9a80aced5cc54d2509cd2504fd1b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of embedded external links to other PDF files hosted across numerous domains. This technique is often used for SEO spam or to distribute a variety of malicious content or phishing lures. The ML classifier strongly indicated maliciousness, and the PDF structure with a link farm supports this assessment.

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://robertshrigleywoolf.com/uploads/1/3/1/1/131164110/131164110.html#peggy+bintz+np+hendersonville+nc
    • http://wisdomspeacefarm.org/uploads/1/3/0/7/130776229/d77d46e2602.pdf
    • http://www.firstresponsetraininggroup.com/uploads/1/3/0/4/130483499/bejam.pdf
    • http://womeninlawdc.com/uploads/1/3/0/5/130551298/gufegakadarinujeximu.pdf
    • http://homerglenlifestyle.com/uploads/1/3/1/1/131163986/zuvepadud.pdf
    • http://hapicos.com/uploads/1/3/0/7/130738681/18227697.pdf
    • http://mercertruckaccessories.ca/uploads/1/3/0/5/130550742/datopevaginonububig.pdf
    • http://earthspiritpath.net/uploads/1/3/0/5/130550657/1824810.pdf
    • http://www.cce14u.com/uploads/1/3/0/5/130588337/viniva.pdf
    • http://todorovtruffles.com/uploads/1/3/0/4/130493248/xisokagotitu_begojemobuz_bavititiriril.pdf
    • http://www.strozzistawzeeh.com/uploads/1/3/0/5/130588291/00adacb0.pdf
    • http://christophertward.com/uploads/1/3/0/3/130313044/38a19efd089.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c5e.bin
4c82507f0bf8855cf7f37620eb5119aee813337d7fab209e228524899cf9f78f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5E 7812 bytes
font_01_sfnt_off00007ac8.bin
43949651a11e0141dfc60eb3714369aad5813d84d94f08b8286061d056c68bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC8 4192 bytes

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