Malicious PDF — malware analysis report

Static analysis result for SHA-256 640eb302f05b5d72…

MALICIOUS

PDF

35.3 KB Created: 2020-05-15 13:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbeb7890d6b8d758372078ff3c466fb2 SHA-1: 71283570fd4fa33966c02256e700147768d2e9ff SHA-256: 640eb302f05b5d7203cc62be1ebab28b1309f12caae7a81cd57001eacc49a5e8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs likely serve as a link farm or a distribution mechanism for further malicious content, potentially leading to exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://talordfrench.com/uploads/1/3/1/6/131636629/131636629.html#simple+subject+and+complete+subject+worksheets
    • http://inpursuit21century.org/uploads/1/3/1/8/131856699/3625078.pdf
    • http://apgunworks.us/uploads/1/3/1/3/131379553/8959000.pdf
    • http://gobreakfastclub.com/uploads/1/3/0/3/130379299/2280007.pdf
    • http://wolfmoon.farm/uploads/1/3/0/9/130969079/zovid.pdf
    • http://swirl-360.com/uploads/1/3/0/4/130488698/devatesekoxoxelugu.pdf
    • http://daraspentopaper.com/uploads/1/3/1/3/131398268/cfd291.pdf
    • http://mrbrocksclass.com/uploads/1/3/0/6/130639448/b797c3a899110f1.pdf
    • http://apartmentsonthehudson.com/uploads/1/3/0/3/130313398/jaxiwijatiwakoxibifo.pdf
    • http://becomeroyalty.org/uploads/1/3/0/6/130621965/1b63a.pdf
    • http://apg-solutions.biz/uploads/1/3/0/4/130476974/gomub_nalazakuxewugu.pdf
    • http://rosalescbd.com/uploads/1/3/0/9/130969953/6045623.pdf
    • http://pendant-watch.com/uploads/1/3/0/6/130621780/nuloge.pdf
    • http://ambroseuatomotive.com/uploads/1/3/1/4/131437385/kajovojamowiji-xebekev.pdf
    • http://xathlete.org/uploads/1/3/0/6/130621465/a935a9b1.pdf
    • http://envpsintraining.com/uploads/1/3/0/5/130589366/f956590.pdf
    • http://sugarmesweet.net/uploads/1/3/1/4/131438324/wiwexoxu.pdf
    • http://workshopforwriterspress.com/uploads/1/3/0/7/130775115/d7d8818.pdf
    • http://home4birds.com/uploads/1/3/1/3/131382808/vegipotanunil_miguluxedason.pdf
    • http://discoveryactionlearning.com/uploads/1/3/1/0/131070992/d2b180143621a30.pdf
    • http://rourkehealthcareconsulting.com/uploads/1/3/0/2/130270938/muxevamedumejed.pdf
    • http://easyreachsolutions.com/uploads/1/3/1/0/131071191/7285499.pdf
    • http://art-of-drama.com/uploads/1/3/0/2/130270911/43e8d5fc.pdf
    • http://soundfulsoul.org/uploads/1/3/1/3/131381167/3776959439fe.pdf
    • http://sjisff.com/uploads/1/3/0/5/130588336/9040278.pdf
    • http://demcancon.org/uploads/1/3/0/6/130622073/4325094.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ef0.bin
c4285fa33248496de7f795ade4ea3ad3476320bab8f87cb7e747e135ef7edfcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF0 9900 bytes

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