Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf2293fe263f3a7…

MALICIOUS

PDF

43.5 KB Created: 2020-03-16 09:32:23 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f732237dd8a78ae4478299e9d339b429 SHA-1: 0dfae3b0086afcdc389fa3891acb5f1ea56d608a SHA-256: dbf2293fe263f3a7d12ccff2b58c5ae23b4dc2378bb3d0256a265c3cbd7023d8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, a technique often used for SEO poisoning or to distribute malicious payloads. The document body, though partially corrupted, suggests a lure related to a 'courser guide'. The ML classifier strongly indicates maliciousness, and the presence of numerous links to potentially compromised domains supports this assessment. 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://host146.carmichaelnl.com/uploads/1/3/0/6/130604767/130604767.html#bdo+t8+courser+guide
    • http://benstroud.com/uploads/1/3/0/6/130621216/xemeli.pdf
    • http://avant-gardeinspections.com/uploads/1/3/0/3/130313176/683550.pdf
    • http://nintaipartners.com/uploads/1/3/0/7/130738824/6c9cac803bc3e8.pdf
    • http://mail.lifesabeautifulmess.com/uploads/1/3/0/3/130313153/kipoxojuloxogowo.pdf
    • http://deserttotable.com/uploads/1/3/0/4/130490218/vokijax-rinivaw.pdf
    • http://mojovideo.net/uploads/1/3/0/7/130738951/8165356.pdf
    • http://theunlikelylibertarian.com/uploads/1/3/0/4/130476850/pojeruvirax.pdf
    • http://band-ems.org/uploads/1/3/0/6/130639941/zobuxowevufidos.pdf
    • http://birthingwithjillian.com/uploads/1/3/0/9/130969934/44eae51af4bb161.pdf
    • http://hostmaster.blissbubbles.com/uploads/1/3/0/4/130488786/f179d07.pdf
    • http://centralrefrigerationinc.us/uploads/1/3/0/3/130379173/robolufowezipo.pdf
    • http://meyousick.com/uploads/1/3/0/5/130589077/tubotoxufoge-zibaka-vexusomit.pdf
    • http://www.surreyasbestostesting.com/uploads/1/3/0/8/130813516/7180905.pdf
    • http://www.mixedmedia.nz/uploads/1/3/0/7/130776388/274d072d0d215.pdf
    • http://www.hotwaterking.com.au/uploads/1/3/0/5/130588363/tezupovugi.pdf
    • http://assetsassurancellc.com/uploads/1/3/0/2/130291536/9239451.pdf
    • http://academy.hashtagpositivity.com/uploads/1/3/0/6/130639687/saxejiteripivij.pdf
    • http://www.betterartthanin.com/uploads/1/3/0/8/130874583/viroxeteg-talotira-gojikopa.pdf
    • http://winstonclothing.com/uploads/1/3/0/2/130289722/2195636.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_off0000770e.bin
31c2b003750e2a826953eca59ac12d0dc9df994c67af6cd7da093e4f4152cd3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x770E 8312 bytes
font_01_sfnt_off0000970c.bin
e7c11718e0ca052b46a8deac4dbec93171877d4c34ae04b20e08901416504239
pdf-font-stream PDF embedded font (sfnt) at offset 0x970C 2632 bytes