Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc364d8217e39d6a…

MALICIOUS

PDF

48.8 KB Created: 2020-03-29 11:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c6ee3e9d62e07fad063c6bb411eeb6e0 SHA-1: 85032de1ccf6360c740033ab4f882a8a453cddab SHA-256: fc364d8217e39d6a380134d7ccc2d431cfc0ca79ee03ba2843961749f71d227b
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains URLs that are part of this link farm, suggesting a tactic to manipulate search engine results or to host malicious content on a large number of compromised or controlled domains. No scripts were extracted from this sample.

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://74-123-79-231.mgwnet.com/uploads/1/3/0/5/130548152/130548152.html#standards+for+mathematical+practice+posters+pdf
    • http://harperhier.com/uploads/1/3/0/9/130969603/navuwujigejotu.pdf
    • http://kingschimneysweep.com/uploads/1/3/0/4/130483848/3fc71e.pdf
    • http://elesaguaviva.com/uploads/1/3/1/0/131070920/dulexuvezaxalut.pdf
    • http://jhy3.com/uploads/1/3/0/2/130291463/folenab-xifatoxu.pdf
    • http://acerbicompetition.com/uploads/1/3/0/6/130639802/f9ebd2327e372ab.pdf
    • http://humandignitybook.com/uploads/1/3/0/6/130603891/28caab73e8.pdf
    • http://hansonplumbing.net/uploads/1/3/0/2/130289623/vapaba-kizukaw-mozolul-kezinatubaja.pdf
    • http://camvas.org/uploads/1/3/0/7/130739237/5d2bfa7407462.pdf
    • http://trichardsonradiocom.com/uploads/1/3/0/3/130313500/lerapira.pdf
    • http://poiesiscounseling.com/uploads/1/3/0/4/130476135/sazozamijig.pdf
    • http://knxbeats.com/uploads/1/3/1/3/131382797/7a20c28627e.pdf
    • http://cravecateringandcake.com/uploads/1/3/0/8/130874533/fududasimos.pdf
    • http://lsbarbecue.com/uploads/1/3/0/3/130313228/sovomunabubisa-joligenipixoz.pdf
    • http://environmentallandmgmt.com/uploads/1/3/0/3/130324419/pipekazar.pdf
    • http://briannacloss.com/uploads/1/3/1/1/131164124/gezison.pdf
    • http://openarmsbanduk.com/uploads/1/3/0/6/130605388/nosuvapegirowamowi.pdf
    • http://mindfulcollegeadmissions.com/uploads/1/3/0/6/130639956/c4c26e7f1e5.pdf
    • http://jonahandsophiebnaimitzvah.com/uploads/1/3/0/5/130540046/wixuv.pdf
    • http://kpoptakeover.com/uploads/1/3/0/4/130476060/woruz.pdf
    • http://andreaspatinas.dk/uploads/1/3/1/0/131070010/rilebulanesa.pdf
    • http://makermark.com.au/uploads/1/3/0/6/130604642/7365917.pdf
    • http://residentialone.ca/uploads/1/3/0/8/130814576/zitomijij.pdf
    • http://torreyelectricservices.net/uploads/1/3/0/4/130436299/gonugos-vurokubozis-pixafa-poninitapafopaj.pdf
    • http://sampriven.com/uploads/1/3/0/5/130589409/8965f96267.pdf
    • http://ninanolan.net/uploads/1/3/0/4/130476066/1f8d34efe0f.pdf
    • http://sampriven.com/upl
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080ff.bin
9e7791450f15c5e52d5f70d9bb4bb9f7c3cd50e60cb0bb7c3f313c8c91e695ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FF 6760 bytes
font_01_sfnt_off000091bc.bin
252e56bb628a13e78dc60e352cb8a341fd44758d49c8a8923da30004739a4f23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91BC 8588 bytes

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