Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf90d071c85e922…

MALICIOUS

PDF

50.8 KB Created: 2020-05-01 01:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d6dc8b5f762e9403b4bd30b2db186f0e SHA-1: a612b122e7fddc708b16c3c8895e8bcd131d18bf SHA-256: 3bf90d071c85e922e003247b86a508e9ffa983d067137d57c060f2b08fea5760
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. The document body suggests a pretext of a 'follow up on unanswered meeting request sample'. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users to a link farm of potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://three-ps-in-a-pod.com/uploads/1/3/1/1/131164406/131164406.html#follow+up+on+unanswered+meeting+request+sample
    • http://jinenkan.eu/uploads/1/3/1/4/131454503/medixotoniniv.pdf
    • http://rickyrickfit.com/uploads/1/3/0/5/130539934/buwem.pdf
    • http://samplesite300.info/uploads/1/3/1/8/131871478/gekivasa.pdf
    • http://pegasustravelstrailers.com/uploads/1/3/0/2/130287284/ae196ae492b773d.pdf
    • http://sanluisoralsurgery.net/uploads/1/3/0/3/130379549/nesovetofifenowa.pdf
    • http://toplifehacks.ca/uploads/1/3/0/7/130738755/wopixobo.pdf
    • http://zupo.ca/uploads/1/3/0/6/130639947/palalo.pdf
    • http://lyssaslovablejewels.com/uploads/1/3/1/1/131164160/5135869.pdf
    • http://randomfrankshots.com/uploads/1/3/0/7/130776386/7d29c0d38.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d87.bin
6c1540d0a5f855d4e15bdd473811253ecced84a97d0f5166e336a03dbd43194a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D87 6560 bytes
font_01_sfnt_off00009d8f.bin
7cc22c52fe6711b58eed7cf977477eeee66320f344816e51ce65f5c3328bcd44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D8F 8704 bytes

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