Malicious PDF — malware analysis report

Static analysis result for SHA-256 35dc2d7086a80eef…

MALICIOUS

PDF

37.0 KB Created: 2020-03-08 00:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f8f2b0a5bae8899fef027903c1875448 SHA-1: 76ccb09a413580a37e87747c07a1133f69dfa1a5 SHA-256: 35dc2d7086a80eef5502475e21e16608a4c51cb0371b5a4fbad2e456214402f7
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding numerous external URLs disguised as tutorials. The primary heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs, such as http://74-123-76-231.mgwnet.com/uploads/1/3/0/5/130539139/130539139.html#autodesk+autocad+electrical+tutorials, likely serve as the lure to initiate the attack.

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://74-123-76-231.mgwnet.com/uploads/1/3/0/5/130539139/130539139.html#autodesk+autocad+electrical+tutorials
    • http://unidosporlaprofesion.com.ar/uploads/1/3/0/5/130550973/maruf.pdf
    • http://www.drkerriesmedley.com/uploads/1/3/0/8/130815277/kuwomajatusavapinewo.pdf
    • http://www.capoeirafitbrooklyn.com/uploads/1/3/0/3/130323755/sabuzimeniw-daporenewevug-zoxoror-dariw.pdf
    • http://plantdrpeter.com/uploads/1/3/0/5/130545753/4957870.pdf
    • http://journeyfilms.net/uploads/1/3/0/2/130272496/8741558.pdf
    • http://angelajanus.info/uploads/1/3/0/7/130740199/6682a.pdf
    • http://learnmycamera.com/uploads/1/3/0/2/130289272/8020657.pdf
    • http://nomadfoodtruck.com/uploads/1/3/0/4/130476243/dasadax.pdf
    • http://karenvankampen.com/uploads/1/3/0/2/130288594/fijipuzurujurano.pdf
    • http://liqourlawvt.com/uploads/1/3/0/7/130740455/wukifalewifi.pdf
    • http://www.micro-g.com/uploads/1/3/0/7/130776727/11a7d87a.pdf
    • http://l�robyr�n.se/uploads/1/3/0/5/130546803/kenojoluz.pdf
    • http://www.lenapegirlssoocer.com/uploads/1/3/0/8/130874161/govigubunibas.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_off000068f1.bin
a554a4216e6cb6c7de6e56e07b283d20ef8a06b0775619565f15ed2b87d9fca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F1 7692 bytes

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