Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b78e35dcc222546…

MALICIOUS

PDF

35.0 KB Created: 2020-05-13 05:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c93c9ee38e9acd84d188f959435f4008 SHA-1: 349f9f9445d4a319fb236670cd606bccf99c4ea8 SHA-256: 3b78e35dcc2225468ded68fce0ae888621247857a9c4844f11141532bf13650b
94 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, a technique often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a vast network of linked PDF files hosted on numerous domains, suggesting a link farm or a distribution network for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://miracleinabucket.com/uploads/1/3/1/4/131483053/131483053.html#ihss+alameda+county+timesheet
    • http://ancient-hearts.com/uploads/1/3/0/4/130483799/5540296.pdf
    • http://sfaffordableflooring.com/uploads/1/3/0/7/130739864/nozeduwuriso.pdf
    • http://shopyoogi.com/uploads/1/3/1/4/131483344/laketuk_bevupede_padujigo_zivig.pdf
    • http://cpanel.cmgsagbay.com/uploads/1/3/1/3/131398187/damanoxixoz_dozunakir.pdf
    • http://band-ems.org/uploads/1/3/0/4/130476039/pulinukisimivod_podex.pdf
    • http://westcoastescrrow.com/uploads/1/3/1/4/131437025/9eb96c77ca.pdf
    • http://nmpstag.com/uploads/1/3/1/6/131606540/291764.pdf
    • http://shrinksync.com/uploads/1/3/0/2/130289320/govefibakeluro-falami-pasuvinaxanewal-muzebiwopube.pdf
    • http://gracebcpc.net/uploads/1/3/0/7/130775529/wenupoturibip-wibuwoken.pdf
    • http://gbritsolutions.com/uploads/1/3/0/6/130604972/nozazopopiwan-gokikawames-fabebelazob.pdf
    • http://lauradipalma-autriceillustratrice.com/uploads/1/3/0/5/130589241/xakegigasugoti.pdf
    • http://behappyespana.com/uploads/1/3/1/3/131398059/5039032.pdf
    • http://830750570238807419.com/uploads/1/3/0/7/130740264/rinim.pdf
    • http://60roll.com/uploads/1/3/0/6/130603944/b3f38932c177c.pdf
    • http://byyoursideac-burrridge.com/uploads/1/3/0/7/130739949/3460111.pdf
    • http://multibidfleet.net/uploads/1/3/0/6/130604459/607fb.pdf
    • http://gotqualifications.com/uploads/1/3/0/2/130289322/7555955.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_off00005d8d.bin
9a918b3fe3e44a27a074dd762477225fe8fdec0b00ad41ac77b3f0dc00af3f14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8D 10116 bytes

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