Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b2dc134420f512…

MALICIOUS

PDF

33.9 KB Created: 2020-06-12 00:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e136d1367952125a0c0aa47f0378536f SHA-1: 5621b7eba6aa5d18163c52e3aac9d8a62b5b73f9 SHA-256: c3b2dc134420f5122b8eb1c0db0e82d9e490048b4eea0573a2d8608c54260700
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm designed to obscure the ultimate destination or to host a large number of similar lures. The ML classifier strongly indicated maliciousness. The embedded document body text, while partially corrupted, contains references to 'autocad architecture tutorials free' and the wkhtmltopdf generator, suggesting a lure for users seeking free software or tutorials, which then redirects to a network of suspicious domains.

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://knockoutsdesign.com/uploads/1/3/1/4/131406985/131406985.html#autocad+architecture+tutorials+free
    • http://fishbowl-labs.com/uploads/1/3/0/3/130323554/4024786372fef24.pdf
    • http://fanatic5.com/uploads/1/3/0/6/130639659/2013554.pdf
    • http://sy.undesirable.us/uploads/1/3/0/4/130488811/ferovitabosumi-ruvofaxemetu-pisufe-vosekot.pdf
    • http://anarchytoken.com/uploads/1/3/1/4/131406807/garofulaf.pdf
    • http://ardsleylatin.org/uploads/1/3/0/7/130775920/869d48ab65.pdf
    • http://brightpropertyfund.com/uploads/1/3/0/7/130776526/vafubebogulobinob.pdf
    • http://thecenterforreikihealing.com/uploads/1/3/1/8/131857527/lojapuvurajavid.pdf
    • http://opsrocket.solutions/uploads/1/3/0/7/130776589/botesazomi.pdf
    • http://oglethorpecountyprek.org/uploads/1/3/0/3/130313046/8b8a5e00f0e91d.pdf
    • http://ipaint.kparkerdesign.net/uploads/1/3/1/4/131408250/10664b7e7.pdf
    • http://goemchoswad.com/uploads/1/3/0/9/130969835/66dc33d976a.pdf
    • http://derbyshirealcoholadvice.com/uploads/1/3/2/3/132303028/vudig-wagumi-tojiwe.pdf
    • http://alighahremaninezhadmiami.com/uploads/1/3/0/5/130589391/tusiselezutalip.pdf
    • http://zensuiteseattle.com/uploads/1/3/0/6/130621185/b3ac8dec5.pdf
    • https://zadejexidaba.files.wordpress.com/2020/06/daxazutosujidujadifopum.pdf
    • https://sunadasuz.files.wordpress.com/2020/06/37906618869.pdf
    • https://lasogotunule.files.wordpress.com/2020/06/80735315873.pdf
    • https://wesegakivur.files.wordpress.com/2020/06/73142972777.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_off00005973.bin
fb064b8a502d280938f2114ec503f76071b594c91c385248db8a495e3cec3d90
pdf-font-stream PDF embedded font (sfnt) at offset 0x5973 10028 bytes