Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff376a273868330…

MALICIOUS

PDF

37.1 KB Created: 2020-03-14 16:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2373504e989d3b1a8b5e6466b873cc1e SHA-1: 99359b8d00c270ad302202ae2f36e9dfb87d02ed SHA-256: dff376a273868330810cead5354268e6d73f322771cb8e14e206647cc57f5a02
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on different domains. The ML classifier also strongly indicated maliciousness. The document body text is largely corrupted but contains a reference to a URL that is also present in the list of extracted URLs. This suggests a link farm or SEO spam campaign designed to drive traffic to potentially malicious content.

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://benkregel.com/uploads/1/3/0/5/130588394/130588394.html#definicion+de+coliformes+totales+en+alimentos
    • http://sammyfit.net/uploads/1/3/0/5/130539229/f94eba721209.pdf
    • http://qramastery.com/uploads/1/3/0/6/130605165/tekus_golaka_lixaruwejogus.pdf
    • http://hostmaster.casamaxi.com/uploads/1/3/0/5/130588570/7856901.pdf
    • http://exhibition-board-hire.com/uploads/1/3/0/4/130435583/jiludorug-xakibufisifog-kunuvi.pdf
    • http://www.mattysenshort.com/uploads/1/3/0/3/130323520/3479c20b5.pdf
    • http://www.virtualadminadvantage.com.au/uploads/1/3/0/3/130313075/bodemode-xosupisapu.pdf
    • http://artbybelen.com/uploads/1/3/0/5/130590279/0128b70f7a.pdf
    • http://www.waynesbororecklessdrivingattorney.com/uploads/1/3/0/8/130874278/b516ada.pdf
    • http://project58serve.org/uploads/1/3/0/2/130287882/7885131.pdf
    • http://mail.justusreiff.com/uploads/1/3/0/5/130551014/5666148.pdf
    • http://kimgustafson.net/uploads/1/3/0/4/130483239/1848947.pdf
    • http://kaaihuebrothers.org/uploads/1/3/0/5/130550888/d39158b.pdf
    • http://www.digitalip.com.au/uploads/1/3/0/6/130639334/jalidifakebag_gegojisiponuw.pdf
    • http://www.hardhatinvestments.com/uploads/1/3/0/2/130288887/wejodimasi.pdf
    • http://www.epcdynamics.co.uk/uploads/1/3/0/5/130589373/526c6a202916.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_off0000694e.bin
067f5074534eeb723773007e7da783b2bf16bc8d3ee39fa2b7fe66bca7d1d12c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694E 8156 bytes

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