Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b53730cb08bfe3…

MALICIOUS

PDF

30.6 KB Created: 2020-04-04 12:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eb7ecb64233e9f98b2944b858f2c779c SHA-1: 3e9075117c19e9a56c2c3713718232fb7764662a SHA-256: 83b53730cb08bfe3e6efed5d074e5c2200c5d11249481f7ba23839449b873db0
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm. This suggests the document is part of an SEO poisoning or link farm scheme, likely intended to drive traffic to malicious sites or host further malicious content.

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://petesfishtales.net/uploads/1/3/0/4/130483912/130483912.html#kodak+easyshare+c182+digital+camera+user+manual
    • http://74-123-77-225.mgwnet.com/uploads/1/3/0/3/130323445/2940608.pdf
    • http://realestateagentgreensboro.com/uploads/1/3/0/4/130488503/7762284.pdf
    • http://voiceroxers.com/uploads/1/3/1/4/131483344/479023.pdf
    • http://citylandscape.net/uploads/1/3/0/5/130550848/solof.pdf
    • http://annadjohnson.com/uploads/1/3/0/2/130271207/2272469.pdf
    • http://sweetholmeeqc.com/uploads/1/3/0/4/130490410/1240053.pdf
    • http://high-rail.org/uploads/1/3/0/7/130776033/167133.pdf
    • http://stefansinger.com/uploads/1/3/0/5/130543743/1052643.pdf
    • http://retruckaust.com/uploads/1/3/0/7/130776122/2032489.pdf
    • http://midnaetur.com/uploads/1/3/1/4/131407492/d7f6ce4.pdf
    • http://myabloomstore.com/uploads/1/3/0/9/130969079/turetododedenel.pdf
    • http://joesnewandusedfurniture.com/uploads/1/3/0/4/130436040/c34b9.pdf
    • http://marantoballroomacademy.com/uploads/1/3/0/7/130739234/tigalu.pdf
    • http://smartchoicecare.net/uploads/1/3/0/7/130775033/76752772.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_off00005259.bin
0a0fd69480f4073d9ca695d406ca2ebf25d5fb13ac9e35ce012856d2e656bac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5259 6700 bytes

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