Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d03cacf3f46a92…

MALICIOUS

PDF

54.0 KB Created: 2020-03-22 06:23:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 53d74a18812b037722849663a42df990 SHA-1: eff17e409551f06b35e89d2ce5b56a41d15f64af SHA-256: 65d03cacf3f46a923d265dac043353adfe3eb3969510bf745a02b836bc7ec71e
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a method to distribute further malicious content. The ML classifier strongly suggests malicious intent. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings, reinforcing the malicious nature of the sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hbcphx.org/uploads/1/3/0/8/130814110/130814110.html#modelo+contrato+de+joint+venture+en+colombia
    • http://txplanetsub.com/uploads/1/3/0/8/130814475/b709f6ae16845f.pdf
    • http://lonepeakwoodworks.com/uploads/1/3/0/5/130588954/7539267.pdf
    • http://idlewildmusicroom.com/uploads/1/3/0/6/130620228/febenajeja_lusukajovomur_gobusumimuvaz_nosofuduvebagow.pdf
    • http://clientretentionsuccess.com/uploads/1/3/0/7/130775825/jakafifona.pdf
    • http://www.shopkaykaysplace.com/uploads/1/3/0/4/130435673/dovusotefugis-vimewu-winatulesolo.pdf
    • http://krystalsforthespirit.com/uploads/1/3/0/5/130538838/1945728.pdf
    • http://naturalandpermanentbodyadornment.com/uploads/1/3/0/5/130590312/vovupipanazan-jotigi-wefuwirarekofu.pdf
    • http://www.emsthetics.com/uploads/1/3/0/9/130969357/5542485.pdf
    • http://resurrectionofarunner.com/uploads/1/3/0/6/130620776/gezazu_gonamemoxev_nozudelo_xifegiteliladi.pdf
    • http://www.financialmann.com/uploads/1/3/0/6/130640225/642fb8f638af.pdf
    • http://shop.akcesoriacorp.com/uploads/1/3/0/7/130740213/1170958.pdf
    • http://www.henonagritech.com/uploads/1/3/0/8/130874307/wokuxepuve.pdf
    • http://zonemaster.mangalamwesseling.com/uploads/1/3/0/4/130476485/vadose-rolonagepukew-tetezepifomabo.pdf
    • http://movingcompanyokc.com/uploads/1/3/0/6/130604651/4fcec186c3.pdf
    • http://dougwessels.com/uploads/1/3/0/2/130287457/xosefixinaguval.pdf
    • http://mufgmx.com/uploads/1/3/0/4/130477829/4167744.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009240.bin
845f16d141a60ce5b68c6bea79048962e449babeb477dc83c4d0ea2e94bf3c90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9240 9356 bytes
font_01_sfnt_off0000b400.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB400 16036 bytes

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