Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b37296e44d86211…

MALICIOUS

PDF

36.3 KB Created: 2020-04-08 06:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ffd580b5391e838989379a6d0a379be1 SHA-1: c42788d3e0651806fe3fe00ec419bae259de6034 SHA-256: 7b37296e44d8621137142b95dc67a79c736df41ee75d1283f3113a6a2ac06cf7
62 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO poisoning technique, designed to drive traffic to potentially malicious content. The document body, though heavily obfuscated, contains references to educational topics and URLs, suggesting a lure to disguise the malicious intent. The primary mechanism appears to be redirecting users to a network of hosted PDF files.

Heuristics 3

  • 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
  • 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://lipscombacademypto.org/uploads/1/3/0/4/130488811/130488811.html#inequality+word+problems+worksheet+algebra+1
    • http://bintiessence.com/uploads/1/3/1/4/131406285/1878754.pdf
    • http://palmecc.com/uploads/1/3/0/4/130488590/663d1433f6176.pdf
    • http://michiganpc.net/uploads/1/3/0/5/130588968/3feb8500325c9f.pdf
    • http://mariodigiovanni.com/uploads/1/3/0/4/130436196/rolulijukazuponekoxe.pdf
    • http://lordoftheblocks.com/uploads/1/3/0/6/130620728/regizesekof.pdf
    • http://orcphanage.com/uploads/1/3/0/4/130476974/kexafewizigabagar.pdf
    • http://tainoworldorganization.com/uploads/1/3/0/3/130324191/5d23cab482b.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_off00006235.bin
ffd46d546e5dc48e92adb881dd745d431ea7f184331860c84a8644bef290d9bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6235 8476 bytes

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