Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b4928b57add57b…

MALICIOUS

PDF

39.3 KB Created: 2020-03-13 03:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 680cf7981d8ce1dcee227b85bb8409ee SHA-1: 808e33bd54bbb6171b369cd0ca7ccf7355679524 SHA-256: 05b4928b57add57b39eadc37034635323cd63a3399930b8202aeb740116cb24e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document employs a link farm and suspicious link lure technique, embedding numerous links to external PDF files on various domains. The document body, though partially corrupted, contains text related to 'Hindi typing keyboard software free download for windows 7', suggesting a lure to trick users into clicking these links. The ML classifier strongly indicates maliciousness, and the sheer volume of external links points towards a campaign to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://a1515530xstreamtravel.xsideas.com/uploads/1/3/0/3/130379429/130379429.html#hindi+typing+keyboard+software+free+download+for+windows+7
    • http://remote.totaalservicetuinbouw.nl/uploads/1/3/0/4/130488547/jexeruj_sirixotojijole_tidipetune.pdf
    • http://cookstown.ca/uploads/1/3/0/4/130483457/61e157777ae.pdf
    • http://lariateers.com/uploads/1/3/0/6/130639397/2959504.pdf
    • http://acrowscalling.com/uploads/1/3/0/6/130622025/remitu.pdf
    • http://www.kilderkin.net/uploads/1/3/0/6/130603838/papafiwiwovome.pdf
    • http://onlinesecurityservice.site/uploads/1/3/0/4/130489499/konagizanizojegof.pdf
    • http://luisaquezdayoga.ca/uploads/1/3/0/6/130605259/2fdb58bc.pdf
    • http://lobotank.com/uploads/1/3/0/6/130604104/edb873d.pdf
    • http://strongrootsfoundationmn.org/uploads/1/3/0/3/130379118/welezemil.pdf
    • http://nashvillerollingpins.com/uploads/1/3/0/8/130814462/f465442bc.pdf
    • http://merrystreet.com/uploads/1/3/0/8/130814338/tinusujet.pdf
    • http://moskamusic.com/uploads/1/3/0/8/130814132/d78dda3a36444.pdf
    • http://jimreardonpoet.com/uploads/1/3/0/7/130775462/jurupub_pofuzowifojidaz.pdf
    • http://hostmaster.housemusicyorkshire.co.uk/uploads/1/3/0/3/130323213/113e12d3f479.pdf
    • http://www.opiadelaide.com/uploads/1/3/0/5/130543761/4096492.pdf
    • http://craigfrost.co.uk/uploads/1/3/0/3/130313729/1086296.pdf
    • http://shamrocksandshenanigans.org/uploads/1/3/0/7/130739867/bezamugutev-nusalifol-diwujokulugup.pdf
    • http://hostmaster.rockwithbenefits.pt/uploads/1/3/0/4/130476045/jafuk.pdf
    • http://360teamllc.com/uploads/1/3/0/3/130379474/dajadu.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_off00007041.bin
52847b63f99cea113000ae0e4db95461c509bbeb8de25ace3c206cc54c16f166		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7041 7996 bytes

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