Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c30183b8a32446…

MALICIOUS

PDF

46.1 KB Created: 2020-03-28 10:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0b92f008d2263fdd70cf2f13ef7f3e2d SHA-1: dea6a7c34955d61672b3c13d2754822e6b8d0a28 SHA-256: 89c30183b8a324464729d5588447781169ec45bbc8dd575c6b5b4bb765be04a6
94 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are structured as a link farm. The document body, though heavily obfuscated, contains references to 'Xerox workcentre 3220 driver' and URLs that appear to be part of a SEO-based distribution scheme. The ML classifier strongly indicated maliciousness, and the presence of a large number of external links suggests a drive-by download or phishing attempt.

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://thequantumsecret.net/uploads/1/3/0/9/130969858/130969858.html#xerox+workcentre+3220+driver
    • http://www.marginfarmer.com/uploads/1/3/0/9/130969465/b7e7db6d1.pdf
    • http://bangkokrepublik.co/uploads/1/3/0/6/130639461/b4a5b9d8.pdf
    • http://robinzefersclark.com/uploads/1/3/0/2/130288551/1d94d32.pdf
    • http://needahouse.net/uploads/1/3/0/7/130740538/a960d901bf41ef3.pdf
    • http://store-today.com/uploads/1/3/0/6/130621328/8329380.pdf
    • http://matiaspatrick.com/uploads/1/3/0/5/130551551/jisak.pdf
    • http://mackenzieemievents.com/uploads/1/3/0/5/130543240/gaxosafatawir-zidisanono-nerozipo-sitenerixosom.pdf
    • http://www.riversidemetalroofing.com/uploads/1/3/0/4/130478123/fixiwa.pdf
    • http://snbsfoundation.net/uploads/1/3/0/8/130814351/vikubavafegot.pdf
    • http://weareriot.org/uploads/1/3/0/5/130543070/vibasewe-dofomod-xavojikeruxile.pdf
    • http://www.bimedical.net/uploads/1/3/0/7/130776877/62a83d2.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_off00008afa.bin
6f55ac61acd90f98758d5c7584e82a37d300ea25348ef72a0752074caaa88290		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFA 9488 bytes

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