Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1496b2b2085c44…

MALICIOUS

PDF

42.3 KB Created: 2020-03-13 02:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 71effbb6aa7a21ac0c7b157ed5e83ba1 SHA-1: 7c4c0fe95f697432c828b54543ae1ee49abec300 SHA-256: 5d1496b2b2085c442482ac3c6581b99b531e0e3bbf0efc840313fec8e14b7f52
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It contains a large number of embedded external links, indicating a potential link farm or a method to redirect users to malicious sites. The primary URL identified is http://riversidecountyhistory.org/uploads/1/3/0/7/130739048/zofuvofi.pdf, which is part of a pattern of numerous similar URLs hosted on various domains.

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://riversidecountyhistory.org/uploads/1/3/0/7/130739505/130739505.html#que+es+un+nodulo+tiroideo+calcificado
    • http://www.plastercovingshop.com/uploads/1/3/0/8/130873829/3125530.pdf
    • http://www.scholarlycitizens.com/uploads/1/3/0/6/130621228/47cb62a94.pdf
    • http://ezit.solutions/uploads/1/3/0/2/130271153/9619128.pdf
    • http://astarboards.com/uploads/1/3/0/2/130272886/noponimekaposove.pdf
    • http://ncldecor.com/uploads/1/3/0/6/130620501/91576f83f7ca0.pdf
    • http://scifilms.co.nz/uploads/1/3/0/2/130289305/faxelug_xudadeg_xuzoto_pakutuz.pdf
    • http://www.wanderlusteatery.com/uploads/1/3/0/7/130739048/zofuvofi.pdf
    • http://www.truthfortots.net/uploads/1/3/0/3/130323597/134123.pdf
    • http://bristlebear.com/uploads/1/3/0/6/130603858/kewupotev.pdf
    • http://orbitsingle.com/uploads/1/3/0/9/130969445/4576688.pdf
    • http://ilievlab.de/uploads/1/3/0/6/130639547/29fdc7.pdf
    • http://www.lmwaterfalls.co.uk/uploads/1/3/0/3/130323196/8039572.pdf
    • http://samcars.eu/uploads/1/3/0/7/130775244/7600958.pdf
    • http://www.shop.poolesvillepickers.com/uploads/1/3/0/4/130476483/kuxuxakokos_figabafiwimulom.pdf
    • http://lunaspress.com/uploads/1/3/0/6/130604197/raposadudelesun.pdf
    • http://www.denisecanhelp.com/uploads/1/3/0/5/130540767/7474568.pdf
    • http://maurizio-esposito.com/uploads/1/3/0/7/130776215/sodamix.pdf
    • http://www.arctichunter-th.com/uploads/1/3/0/7/130776132/198b83748a.pdf
    • http://northwoodshandmade.com/uploads/1/3/0/6/130603961/d6324.pdf
    • http://lautbirubungalows.com/uploads/1/3/0/3/130313054/vexitezirolaf.pdf
    • http://kerryloehr.com/uploads/1/3/0/8/130873953/073337ddb7.pdf
    • http://innsandtours.com/uploads/1/3/0/7/130739227/b20e0.pdf
    • http://southern-edge-knife-works-llc.mynewonline.store/uploads/1/3/0/8/130874380/muted_gixukere_wobawug.pdf
    • http://jews4trump.net/uploads/1/3/1/0/131070859/fatotasoro.pdf
    • http://pixelfence.net/uploads/1/3/0/6/130605506/1cdfd2dea970.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_off00007893.bin
75df66f7891f97c34509fb0ac44e63a0ea5e76f82c7abfc2a9e1f8de44f43e4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7893 9148 bytes

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