Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3df0fe93df6e179…

MALICIOUS

PDF

42.3 KB Created: 2020-03-06 15:43:02 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f43dfead4bc1107c30146cf02f60cf2c SHA-1: 8b80ab7f2905b8b3762019ba43cec94067c9118a SHA-256: c3df0fe93df6e17967ae66ada650ed97d0cd3e8d55d240faa914750cbc80de1e
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of seemingly unrelated PDF documents hosted on compromised or attacker-controlled websites. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of specific user-facing lures.

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://algeriaschool.com/uploads/1/3/0/2/130289334/130289334.html#radial+nerve+palsy+patient+leaflet
    • http://jennifferdiaz.com/uploads/1/3/0/7/130739001/58590cabf58c2b.pdf
    • http://nerdbabies.com/uploads/1/3/0/6/130603769/3dcc8.pdf
    • http://color-paper.com/uploads/1/3/0/7/130775698/02eb4ff2ca0.pdf
    • http://aedutah.com/uploads/1/3/0/6/130605083/fiduwajaratix-jakirawal.pdf
    • http://citrussa.org/uploads/1/3/0/5/130590594/suroniledef.pdf
    • http://creditcoaches.org/uploads/1/3/0/8/130814382/806799.pdf
    • http://theright.buzz/uploads/1/3/0/2/130288939/wajezivojemawa.pdf
    • http://mirrorimagemissions.com/uploads/1/3/0/5/130547450/feb289.pdf
    • http://deckmachine.com/uploads/1/3/0/4/130488270/4167e2e6ade.pdf
    • http://mail.udlandscape.com/uploads/1/3/0/3/130379051/3e6b80e415f.pdf
    • http://74-123-78-43.mgwnet.com/uploads/1/3/0/4/130489123/f9641218dbb0f.pdf
    • http://savemorephilippines.com/uploads/1/3/0/5/130589442/tivudenukaka.pdf
    • http://661junkhauling.com/uploads/1/3/0/5/130550972/koteve_nowoxo.pdf
    • http://taranakitimebank.nz/uploads/1/3/0/4/130483266/6385492.pdf
    • http://ahs-2020.com/uploads/1/3/0/9/130969873/e93c8c888f99c7.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_off00007c64.bin
bf69b40195a480b4f14d31bf4e33f27a3fd28fe42a0bfba4264453bbd3f9d37a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C64 8180 bytes

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