Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85321979ddb8c1a…

MALICIOUS

PDF

37.8 KB Created: 2020-05-15 06:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c358ead5dbb5240340d051aa211976a2 SHA-1: b4110f6dd19af6d2fde28b2b11298c9e852fb4d2 SHA-256: d85321979ddb8c1a8fc0e6f151235e87a1419b2d8d4fadc96652c4bdb820d7b8
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. These links point to various PDF files hosted on different domains, suggesting a tactic to manipulate search engine results or to distribute malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body text is largely unreadable binary data, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dobiehills.com/uploads/1/3/1/3/131379268/131379268.html#backsteine+reichsformat+preis
    • http://network4u.net/uploads/1/3/0/6/130605498/xopasa_lokulabadaju_vetuzu.pdf
    • http://medixcanada.ca/uploads/1/3/0/7/130740492/1946f4ee9e8875.pdf
    • http://twentypercents.net/uploads/1/3/0/6/130621654/0bcc366.pdf
    • http://eaton-alive.com/uploads/1/3/0/4/130475973/jekukizejew_zejutit.pdf
    • http://torihamilton.org/uploads/1/3/0/5/130543663/pemokafivodiver.pdf
    • http://elliebellyphotography.com/uploads/1/3/0/4/130476060/mavulo.pdf
    • http://ashevillemusicsahavas.com/uploads/1/3/1/4/131406801/9649931.pdf
    • http://fiddleheadgardenservices.com/uploads/1/3/0/6/130621937/c5657ae72847.pdf
    • http://forubydesign.com/uploads/1/3/1/4/131483440/binovijaxamumej-rejol-nafamekexuvid-vunalisilu.pdf
    • http://nrtusa.com/uploads/1/3/0/5/130541116/c75383d170dd7.pdf
    • http://knmsboutique.com/uploads/1/3/1/3/131380493/luvutefukiw_vuzaketinin_tapez_navedu.pdf
    • http://softwarematisse.com/uploads/1/3/0/4/130483953/6a41f38a3b93a19.pdf
    • http://lashondaherring.com/uploads/1/3/1/1/131164312/1115250.pdf
    • http://thathealthylyfe.com/uploads/1/3/0/4/130435785/titidoburutob.pdf
    • http://sharpcollarmate.net/uploads/1/3/0/6/130620823/tekufezezalipu.pdf
    • http://homesbymichaeld.com/uploads/1/3/0/7/130774969/gefew.pdf
    • http://redrosebyceec.com/uploads/1/3/0/2/130288379/balidi_lovomifukuku_biroladiza_vidizumiwadotas.pdf
    • http://hgoadventure.com/uploads/1/3/0/6/130605165/b5fbf3f.pdf
    • http://thedoghousearizona.com/uploads/1/3/1/3/131379636/e745c0d3508.pdf
    • http://kwanzaaklaus.net/uploads/1/3/0/4/130483623/legapimepekogavi.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_off00006381.bin
cfa29dbc37b28d9b0feee8ffb87922e0cb0fb9e70897532b367d7c36d28a038e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6381 11720 bytes

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