Malicious PDF — malware analysis report

Static analysis result for SHA-256 0535a882b5008216…

MALICIOUS

PDF

51.2 KB Created: 2020-04-18 04:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8f07c4ce783357d0eabcf800642ee1c5 SHA-1: 7cfd2c580b46dc420d79179623dd3871e60860ff SHA-256: 0535a882b5008216b6ffbd5c9b36e7fc424f46a7f8e0d43192d7263155fa65c3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to PDF files hosted on unrelated domains, suggesting a link farm or SEO spamming tactic. One embedded URL, 'http://loggerstrace.net/uploads/1/3/0/8/130874480/130874480.html#element+families+of+the+periodic+table+worksheet', is presented as an educational worksheet, likely a lure to direct users to malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://loggerstrace.net/uploads/1/3/0/8/130874480/130874480.html#element+families+of+the+periodic+table+worksheet
    • http://conectamarketing.org/uploads/1/3/0/8/130813851/275e12cef.pdf
    • http://powerbabes.net/uploads/1/3/1/6/131636917/a0294.pdf
    • http://first50k.com/uploads/1/3/0/4/130488539/4965757.pdf
    • http://simonssays.net/uploads/1/3/0/6/130640162/4cbb95b5c1bf47.pdf
    • http://labelleprairie.com/uploads/1/3/0/7/130774968/tepazuxuzegiragep.pdf
    • http://satmasterkey.com/uploads/1/3/0/7/130775123/3385358.pdf
    • http://summitvg.net/uploads/1/3/0/4/130483400/tokow-zugadogizeva.pdf
    • http://thunderheadcafe.com/uploads/1/3/0/9/130969418/4c5904.pdf
    • http://kimphandesign.com/uploads/1/3/0/5/130551212/6bf70.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_off0000a03e.bin
bdec87314d170fef350d3d820751f2797c150b451b061b2e898dc92095c9a234		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA03E 8428 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.