Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff930054b74e9bc…

MALICIOUS

PDF

41.3 KB Created: 2020-03-21 17:32:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7c1d4d334fdbf05b4c81c6d7ff3d3925 SHA-1: faf260f30e71802fe3a400a512bab2dbb05a2978 SHA-256: 5ff930054b74e9bc5c297e46178bae00030c4999678c30ad30fa36a6a6c0b565
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 other PDFs with numeric slugs, indicating a link farm designed for SEO manipulation. The ML classifier strongly flagged this PDF as malicious, and the embedded URLs suggest an attempt to drive traffic to these sites. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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://alamopost2events.org/uploads/1/3/0/5/130540897/130540897.html#plan+de+estudios+significado+diccionario
    • http://novamedia.dk/uploads/1/3/0/6/130620275/4802856.pdf
    • http://www.buttonedupbedding.com/uploads/1/3/0/7/130776580/8756471.pdf
    • http://webdisk.zeldadoll.com/uploads/1/3/0/5/130588928/palapu.pdf
    • http://accesevaluation.com/uploads/1/3/0/5/130543569/fff23d27a0ee2b.pdf
    • http://www.fordf25.info/uploads/1/3/0/2/130287972/wipefubabok_pulomexof_kebew.pdf
    • http://ezeehandyman.com/uploads/1/3/0/5/130550857/7791374.pdf
    • http://bri-bakingandcatering.com/uploads/1/3/0/9/130969480/kuret.pdf
    • http://imranvj.ca/uploads/1/3/0/9/130969847/gudozuwamiva.pdf
    • http://tuijamantynen.com/uploads/1/3/0/6/130604972/60186.pdf
    • http://turkishnetwork.org/uploads/1/3/0/8/130874330/3f9ba.pdf
    • http://nyforceacademy.com/uploads/1/3/0/7/130739146/1599334.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_off00007081.bin
50494f87d43c386ea629a2728407ef03eedf44a686c26d81e0a6492adc118023		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7081 11408 bytes

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