Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1309b6be8b7b40…

MALICIOUS

PDF

41.9 KB Created: 2020-03-29 14:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ef25d852e38a7e1bac3355964b771003 SHA-1: b6ae6a3a24362ff8db67465d40d21b0cbe66d9f6 SHA-256: 1f1309b6be8b7b40107fa00c6f6e606e5d2468aab60834983f7e45f467ef4cd7
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. The document body contains garbled text and references to a 'Sony handycam hdr cx110', likely a lure to disguise the malicious intent. The primary attack pattern involves directing users to a vast network of external URLs.

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://webdisk.rodhillportraits.com/uploads/1/3/0/7/130739139/130739139.html#sony+handycam+hdr+cx110
    • http://take2cabinetrenew.com/uploads/1/3/0/7/130776564/viserewelimufoxe.pdf
    • http://coolplanetfilm.com/uploads/1/3/0/8/130874248/gorimimuxa.pdf
    • http://theschaeferfamily.us/uploads/1/3/0/8/130874258/4d331d.pdf
    • http://sevenjames.com/uploads/1/3/0/2/130287454/wufesepoxokamegeg.pdf
    • http://boundlessformationz.com/uploads/1/3/0/6/130604304/miwafi.pdf
    • http://14619-110a.ca/uploads/1/3/0/6/130621082/3847129.pdf
    • http://algoorith.com/uploads/1/3/1/3/131383424/205b539f863.pdf
    • http://facileglutenfree.it/uploads/1/3/0/6/130621684/8447839.pdf
    • http://underrated.space/uploads/1/3/0/5/130550912/guwumokewuwoki.pdf
    • http://meghanjaneiro.com/uploads/1/3/0/5/130538880/paxeme.pdf
    • http://pmaaerospace.net/uploads/1/3/0/6/130604536/c4758.pdf
    • http://hsuandrology.org/uploads/1/3/0/6/130604205/949d2e694cfad.pdf
    • http://deodara-multiespacio.com/uploads/1/3/0/6/130604585/7386672447c.pdf
    • http://linktobeyond.com/uploads/1/3/0/5/130589209/vavapaj-ralopagulosep-zugipuzekivur.pdf
    • http://paths2communication.com/uploads/1/3/0/7/130776874/vixetadikuba-titesumom-muraxuzajivun-ziliwen.pdf
    • http://riveroaksextendedstay.com/uploads/1/3/0/2/130289336/be8fcf093fe9.pdf
    • http://shopglobalsession.com/uploads/1/3/0/6/130621956/mesuzub.pdf
    • http://saldanhahealthcentre.com/uploads/1/3/0/6/130620309/7589118.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_off00007ac6.bin
4cd080312b7380ba42550d60fb10259279fe652a044468a45c4694a59bcbe9c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC6 8240 bytes