Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07e008c67b8eb0a…

MALICIOUS

PDF

40.5 KB Created: 2020-03-27 13:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f56842a6be372b26d9f986f70717bd4b SHA-1: a0ca09adadea805c4610e3692e600b860ceec78b SHA-256: d07e008c67b8eb0a51ec6207049b7d3b8c78b37f99ab1efde80eb825e8379489
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO manipulation tactic. The document body, though partially corrupted, contains text related to solving quadratic equations and references the wkhtmltopdf tool, indicating a lure to potentially malicious or unwanted content hosted on the numerous external domains. The ML classifier strongly flagged this PDF as malicious.

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://jhrpropertyltd.com/uploads/1/3/1/1/131164574/131164574.html#resolver+ecuaciones+de+segundo+grado+por+formula+general+online
    • http://usseguros.com/uploads/1/3/0/5/130539479/soniwokubon.pdf
    • http://saromas.com/uploads/1/3/1/1/131164052/1c354fc.pdf
    • http://www.hempkinginc.com/uploads/1/3/0/6/130621451/6052602.pdf
    • http://dimsampaio.org/uploads/1/3/0/6/130621443/mulinewezi.pdf
    • http://larivieraspa.com/uploads/1/3/0/4/130483329/9513815.pdf
    • http://yellowpayhk.com/uploads/1/3/0/5/130589122/fb300198aba6ae.pdf
    • http://sweetwatermanors.com/uploads/1/3/0/6/130622047/gavubawaboperid_gigodij.pdf
    • http://ou-sooners.us/uploads/1/3/0/4/130488812/fefomonafa.pdf
    • http://roofers.nyc/uploads/1/3/0/7/130739655/7d4d9be.pdf
    • http://hostmaster.fleetvilleswingband.co.uk/uploads/1/3/0/5/130543600/7598187.pdf
    • http://usu-retona.site/uploads/1/3/0/6/130621201/1784169.pdf
    • http://farm-art.net/uploads/1/3/0/7/130775878/sopuvitarogisow.pdf
    • http://krivak.com/uploads/1/3/0/4/130435888/4066689.pdf
    • http://classicstudioandphotolab.com/uploads/1/3/1/0/131069935/varezer.pdf
    • http://benjamingoldbergdmd.com/uploads/1/3/0/5/130539866/bitawirafu.pdf
    • http://h2ocomponents.com/uploads/1/3/0/6/130639028/4820147.pdf
    • http://danskasfalt.com/uploads/1/3/0/6/130604528/sinokobobigivafibu.pdf
    • http://hushloungeonair.com/uploads/1/3/0/8/130814133/xugidatuku-jitejolot-pakoxivu.pdf
    • http://maxwelgrp.com/uploads/1/3/0/9/130969922/guledifabexif_dumujefisinavu_bunufove.pdf
    • http://www.boulderclassicalmusicians.com/uploads/1/3/0/6/130621917/2254070.pdf
    • http://hopevillageinc.org/uploads/1/3/0/5/130550736/rezabamojezag_nomaridepo_vukonum.pdf
    • http://site37675.mywhc.ca/uploads/1/3/0/6/130603961/fda3e.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_off00007557.bin
ac77d5d7b63c8c86776e91272482bd2dc4927e980244f87057fa0b7411282cf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7557 7720 bytes

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