Malicious PDF — malware analysis report

Static analysis result for SHA-256 0850b33a4bc4dd74…

MALICIOUS

PDF

78.8 KB Created: 2021-03-21 20:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4014d381ed72a3f0f9f5b5d79e89bf3e SHA-1: 4a26b03fbb01a96075d77313252457ff9f12db33 SHA-256: 0850b33a4bc4dd745c340f03ab9160c50a514ba68a405755f0bc8a62b94287ae
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link leading to 'golowaki.ru'. This URL, combined with the heuristic firing 'PDF_SEO_LINK_FARM', suggests a phishing or SEO poisoning attempt to redirect users to malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/award?keyword=nike+balance+sheet+2020+pdf
    • https://zesakexe.weebly.com/uploads/1/3/5/3/135314388/8178572.pdf
    • https://cdn.sqhk.co/bozogekeji/ggdjgia/noxulizebale.pdf
    • https://vilofezilo.weebly.com/uploads/1/3/0/7/130740065/neniruxafijajip.pdf
    • https://fixoxotogixas.weebly.com/uploads/1/3/4/3/134374926/1bdc78c8fdc86d7.pdf
    • https://cdn.sqhk.co/mipemoku/rgeWigj/jakimujekipiperulifud.pdf
    • https://cdn.sqhk.co/noxisoture/rjcCifX/veximewutikupuwipaf.pdf
    • https://xasufedi.weebly.com/uploads/1/3/4/6/134683860/1497200.pdf
    • https://mosivupidener.weebly.com/uploads/1/3/1/6/131637589/8895354.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/metakibeme/49608298736.pdf
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_ba904482e38242f4b430421174d74044.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b2aa009c-4853-49cc-a1f4-c423365f00ee/descargar_un_puente_hacia_terabithia_castellano.pdf
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_07ba08e4960949fea5a391b6b475ab55.pdf?index=true
    • https://uploads.strikinglycdn.com/files/04491c9f-8d3d-4105-96f0-87de05f9b1f2/59814826048.pdf
    • https://s3.amazonaws.com/mudurixo/how_to_reset_honeywell.pdf
    • https://s3.amazonaws.com/rozebofukixus/apa_citation_format_generator.pdf
    • https://s3.amazonaws.com/wazagidonux/67058417446.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_off0000f37e.bin
82f31a45cd65dc9a01f8788759efec2cb9b9e69c5be9594f6fe519a8fd3c7188
pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 5596 bytes
font_01_sfnt_off0001068b.bin
0e759d20f9632fa528ac7798f7c9499c25effddf4be6a8878a3789c185ac669c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 11364 bytes