Malicious PDF — malware analysis report

Static analysis result for SHA-256 7967c7446b4654a7…

MALICIOUS

PDF

41.7 KB Created: 2020-04-13 05:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c16c4abc06c0afb9986d7b6d1dbf41ad SHA-1: 406f9dd847e78afe95a974eb77ecfb9348236adc SHA-256: 7967c7446b4654a7ef526a5ec413b84d053cdf542a91f65b6e5336df713afb49
96 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to contain junk data, but the presence of numerous links to other PDF files suggests a link farm or a distribution mechanism for further malicious content. No scripts were extracted, but the structure and heuristics point to a malicious intent to redirect users to potentially harmful external resources.

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://trueslime.com/uploads/1/3/0/4/130489168/130489168.html#arte+mayor+arte+menor+ejemplos
    • http://diamonddoorwayacademy.net/uploads/1/3/0/5/130588478/dixoli_duvitaj_zesujurikas_ritit.pdf
    • http://willinghamdiamonds.com/uploads/1/3/0/4/130489536/8471683.pdf
    • http://sharksfarmtours.com/uploads/1/3/0/9/130969130/7948809.pdf
    • http://kalyaan.org/uploads/1/3/1/3/131379965/ee892850.pdf
    • http://beyouboxes.com/uploads/1/3/1/3/131380687/gagepajix.pdf
    • http://davisionfilms.com/uploads/1/3/0/7/130739268/9823d2.pdf
    • http://manxadvocacyproject.net/uploads/1/3/0/5/130588393/4556564981.pdf
    • http://timfoleydevelopment.com/uploads/1/3/0/5/130550683/528283.pdf
    • http://academyafidnon.com/uploads/1/3/1/4/131453247/8357572.pdf
    • http://peerlesselegance.shop/uploads/1/3/0/3/130379067/turonimal-pisusolub-nivigawebe.pdf
    • http://buckowskinguyen.com/uploads/1/3/0/2/130272586/lewobuxepazi.pdf
    • http://lineaamericana.com/uploads/1/3/1/4/131452987/rumom-xuzosokewow-xibig-xuxavulilexaze.pdf
    • http://jmbcontractslimited.com/uploads/1/3/0/5/130539979/wapepijaril_kolelux.pdf
    • http://footecontractingllc.com/uploads/1/3/0/5/130588239/3127d802f.pdf
    • http://irishcollins.com/uploads/1/3/1/4/131438216/zadafer.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_off00006eb9.bin
bbdf74a00505225415a4790195bbc716cfd4a221264064c1134583e38c9d1b07
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB9 8796 bytes
font_01_sfnt_off00008edc.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDC 2652 bytes