Malicious PDF — malware analysis report

Static analysis result for SHA-256 86808c5758cd1b4d…

MALICIOUS

PDF

52.3 KB Created: 2020-03-25 13:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a150aa22263f5407f634206361ec0446 SHA-1: 1115e388d1e8e863f1d0f7b2005f5abb210d2d07 SHA-256: 86808c5758cd1b4db00282418662cceee27137999554ffd78d8b01e35efc7977
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or distribution network. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of external links suggests an attempt to manipulate search results or redirect users 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://blueharbour.org/uploads/1/3/0/5/130589040/130589040.html#en+que+consiste+el+realismo+juridico+americano
    • http://shreekalaniketan.com/uploads/1/3/0/6/130621544/sijami-zukujujapu-zuxupukiku-sazugasixogasop.pdf
    • http://mommyandbee.com/uploads/1/3/0/5/130544390/3311ee.pdf
    • http://takebackministries.com/uploads/1/3/0/5/130588268/wamuronezerorug-dedulinixun.pdf
    • http://geoeducatedguessr.com/uploads/1/3/0/3/130323552/5864740.pdf
    • http://corsocomoexperience.com/uploads/1/3/0/5/130547078/fuminu.pdf
    • http://alaskakarate.org/uploads/1/3/0/7/130775248/1491336.pdf
    • http://www.pof-freecallsactivation.org/uploads/1/3/1/0/131070387/63b87480e.pdf
    • http://highsocietyreserveclub.com/uploads/1/3/0/7/130776688/kaverurapojole.pdf
    • http://7soundenergy.com/uploads/1/3/0/6/130620857/bogesazasutij-xofufi-tetevavoba.pdf
    • http://gvwp.org/uploads/1/3/0/6/130639034/2811287.pdf
    • http://thebalancelifestyle.com/uploads/1/3/1/0/131070207/fasujeg-voxexera-tulitemen.pdf
    • http://getstyledbylulu.com/uploads/1/3/0/6/130621546/4757575.pdf
    • http://berksmoviemadness.com/uploads/1/3/0/5/130590229/acf10f9463c5b7.pdf
    • http://spreadbitcoins.com/uploads/1/3/0/4/130435589/3c6037851.pdf
    • http://belletravels.com/uploads/1/3/0/7/130738700/wapixugek_wevubabozavi_juxovijuko.pdf
    • http://www.thegoldenstateacademyschoolofspeechanddebate.com/uploads/1/3/0/6/130621140/8a9fe63.pdf
    • http://gratituding.org/uploads/1/3/0/7/130739528/576159.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f8f.bin
a03400cb391ac645cff769a96843a0a899e51d233a68441b12c2681d5ee9015b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8F 10712 bytes
font_01_sfnt_off0000a2dc.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2DC 2652 bytes
font_02_sfnt_off0000ac43.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC43 16036 bytes

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