Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed1763c941c3c48…

MALICIOUS

PDF

38.4 KB Created: 2020-05-19 01:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4582722db92dfe115e7e4b1d9d1efaf SHA-1: f86ff785b7a297350422ba06f8ad5c623e8997f4 SHA-256: 4ed1763c941c3c481bfe0223489c5729449a101158e3769aa1ad31a9310f4fc6
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to various domains, many of which appear to be part of a link farm designed for SEO manipulation. The primary lure seems to be related to professional dossier examples, directing users to a network of PDF files hosted on these domains. The ML classifier strongly indicated maliciousness, supporting the interpretation of this as a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://fostercaresurfacesolutions.com/uploads/1/3/1/4/131438427/131438427.html#dossier+professionnel+exemple+rempli
    • http://bondisquashclub.com/uploads/1/3/0/6/130639801/53db740.pdf
    • http://spinecraft.biz/uploads/1/3/1/6/131606668/gowipekukenisurapoxu.pdf
    • http://hodlcanister.com/uploads/1/3/1/3/131398046/aaf9adc57551.pdf
    • http://wooddems.org/uploads/1/3/0/2/130272282/gabovumifupane.pdf
    • http://raisintheblues.net/uploads/1/3/0/7/130738562/8402523.pdf
    • http://estheaprague.com/uploads/1/3/0/6/130604069/4292337.pdf
    • http://mapleshot.com/uploads/1/3/1/4/131413603/2d126a0cf.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_off00006881.bin
0b3a90e36ba9c622e8fd08bb14890943f016f26789c989097a3a7d5c78955ae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6881 11644 bytes

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