Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2240d20d0bf308…

MALICIOUS

PDF

85.9 KB Created: 2021-04-03 22:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c1a17494cba97a2c3998f99582157df SHA-1: db74d23cc1c4e963acfa93ace777b352fac68394 SHA-256: 6f2240d20d0bf308db3ebd4767579c766d958a858214126c542af99ea48d643c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or direct users to potentially malicious sites. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics point towards a phishing or content-farming attack vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://midufefew.ru/wix?keyword=escudo+de+mexico+tattoo
    • https://cdn-cms.f-static.net/uploads/4501383/normal_601a7793afe24.pdf
    • http://befodafojedugan.22web.org/bataradobarifelumuzisapi.pdf
    • https://cdn-cms.f-static.net/uploads/4365582/normal_6010b6fa797e7.pdf
    • https://kaxufuramizoval.weebly.com/uploads/1/3/5/3/135387701/nojomepinawuk.pdf
    • http://zogaranana.22web.org/jixutebugadutejumanudawuz.pdf
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5fd63999c5399.pdf
    • https://zosotise.weebly.com/uploads/1/3/5/3/135393527/setanijan_lomemiwonew_gasiwugoxol.pdf
    • http://mosilosa.iblogger.org/remogegedom.pdf
    • http://zajifokabatu.iblogger.org/lawiwogowifak.pdf
    • https://jugomezaxazodo.weebly.com/uploads/1/3/5/9/135994004/39b7868623.pdf
    • https://static.s123-cdn-static.com/uploads/4451752/normal_6005afbaa4fb8.pdf
    • https://cdn-cms.f-static.net/uploads/4387229/normal_6054062b7f35a.pdf
    • https://cdn-cms.f-static.net/uploads/4368505/normal_6054d46ea8d74.pdf
    • https://cdn-cms.f-static.net/uploads/4380380/normal_603fa1ad2c68b.pdf
    • https://cdn-cms.f-static.net/uploads/4468814/normal_601fb76a2813c.pdf
    • https://static.s123-cdn-static.com/uploads/4408881/normal_5fc61d885ab22.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/383f5099-18e6-466b-ba8b-4ea3cc873795/minn_kota_talon_10_vs_12.pdf
    • http://tepuxomer.rf.gd/oxford_picture_dictionary_vietnamese.pdf
    • https://uploads.strikinglycdn.com/files/bd4c3266-71c0-4f72-a9d8-909e3b97f9a4/signs_a_guy_is_interested_in_you_long_distance.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001129a.bin
107d8a5320b3291fd1aa87dd451ca855d1f6ee8c1efa314e4187dbbffd6368db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 4984 bytes
font_01_sfnt_off00012381.bin
797c92bb182160e68c6caeb3c660874cf9fcc726932f6042058539809ed82699		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 12124 bytes

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