Malicious PDF — malware analysis report

Static analysis result for SHA-256 d803f03a701bb68a…

MALICIOUS

PDF

37.8 KB Created: 2020-03-25 07:07:29 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 128b6ebe0af8e289a0ba389ad837e0f1 SHA-1: 3ee3e639e42e4310a08292fee2b3c7d7efae3063 SHA-256: d803f03a701bb68aa722f0260536e3feab6fead02e5bba6c79716f6159e80693
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique commonly used in SEO link farms to artificially inflate search engine rankings or distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external PDF link farm. No scripts were extracted from this sample.

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://zumarock.org/uploads/1/3/0/9/130969492/130969492.html#rubrica+para+evaluar+una+exposicion+oral+pdf
    • http://apparel-articlefifteenbrewing.com/uploads/1/3/0/8/130874313/1757594.pdf
    • http://parishonline.tv/uploads/1/3/0/4/130483836/pigiz.pdf
    • http://mljmusic.org/uploads/1/3/0/2/130289558/6080261.pdf
    • http://gostrong.nl/uploads/1/3/0/5/130550847/gokeju_wuxarexibem_ratugolov.pdf
    • http://www.grian.cz/uploads/1/3/0/7/130774993/vufuwopitu-towejo-dadivonizozesoz-roxezekusakako.pdf
    • http://mail.wahmee.com/uploads/1/3/0/5/130546076/7127611.pdf
    • http://mobileopsdetailing.com/uploads/1/3/0/6/130603789/sezozenu.pdf
    • http://smosupport.com/uploads/1/3/0/7/130739063/2e896e560976924.pdf
    • http://cynthiaswigs.com/uploads/1/3/0/2/130289655/6575f43cf79838.pdf
    • http://hostmaster.honitonchamber.org.uk/uploads/1/3/0/8/130874049/kexupikulelub_nokuroruf.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_off00005ff6.bin
4fff69bb6c311e304d84ca87853e75b10b90c0d23091329cb061538ca9187af2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF6 8760 bytes
font_01_sfnt_off00007f86.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F86 1708 bytes

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