Malicious PDF — malware analysis report

Static analysis result for SHA-256 087005dcf70567d1…

MALICIOUS

PDF

45.9 KB Created: 2020-03-09 07:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 147a587c411dc95fbb55da294022a54b SHA-1: 21697aaa5465c036235f500d37cf423b24b06b84 SHA-256: 087005dcf70567d1f20dde748e5aa81ffefc1cf7b697dc759175509036909e27
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, a technique often used for phishing or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic identified a mass external link farm. While no scripts were explicitly extracted, the presence of numerous URLs suggests an attempt to redirect the user to potentially malicious websites.

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://9mn3i.bpmtc.com/uploads/1/3/0/2/130272432/130272432.html#5.+what+are+the+big+five+personality+traits
    • http://asterstudios.com/uploads/1/3/0/6/130620295/girepi.pdf
    • http://psychologyoffashion.co.uk/uploads/1/3/0/5/130550817/mizapa-xukasat-wogiziz-kenasikafujufop.pdf
    • http://partywife.net/uploads/1/3/0/7/130739538/34349ca9f.pdf
    • http://amdlifestylemgmt.com/uploads/1/3/0/6/130640063/1043622.pdf
    • http://www.shirahstern.com/uploads/1/3/0/6/130639459/2646879.pdf
    • http://gofunavi.com/uploads/1/3/0/9/130969656/3543673.pdf
    • http://wwrunbc.shop/uploads/1/3/0/9/130968931/goxivev_xowiloxudud_nalomenadopo_pugukagom.pdf
    • http://computerreader.com/uploads/1/3/0/3/130323422/juvudalesejugep.pdf
    • http://www.mycentralparkwest.com/uploads/1/3/0/6/130621516/67c1a645.pdf
    • http://salmoncommander.org/uploads/1/3/0/5/130543667/5272149.pdf
    • http://webmail.alisonrothman.com/uploads/1/3/0/5/130588307/zugomel.pdf
    • http://augmentedrealitytech.com/uploads/1/3/0/6/130620819/wawujopifaji.pdf
    • http://mypowdercoat.com/uploads/1/3/0/7/130739937/muzuf.pdf
    • http://marklawfirms.com/uploads/1/3/0/7/130775786/6883539c20.pdf
    • http://www.gatesofsantabarbara.com/uploads/1/3/0/5/130551282/vugobavaja_galas_muduledilenu.pdf
    • http://hostmaster.lewisfieldhouse.com/uploads/1/3/0/8/130813866/telesinupofu.pdf
    • http://wesmarconstructiongroup.com/uploads/1/3/0/4/130490808/wuteva_kenirotuju_kisuderelogu_narixilig.pdf
    • http://www.napierpharmacy.co.nz/uploads/1/3/0/7/130739433/ad90d.pdf
    • http://mail.glenmoreyorkies.com/uploads/1/3/0/4/130436140/tatemi.pdf
    • http://meridian.group/uploads/1/3/0/4/130489969/6605506.pdf
    • http://achillesstravoravdis.com/uploads/1/3/0/4/130483963/luxudoxanezo.pdf
    • http://www.900biscayne1712.com/uploads/1/3/0/8/130873842/4918a57ea.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000813c.bin
f3d89d3589170c9acb0b9a8d58dc11735401e1ea8ece91c1dc77908808e4fbf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x813C 7644 bytes
font_01_sfnt_off00009f18.bin
6dc6e07f93ae70488a19e8a398a1c6cda2f5723fc3d3cbe180c5afbb10c3611e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F18 2864 bytes

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