Malicious PDF — malware analysis report

Static analysis result for SHA-256 61062ca7c79a6da7…

MALICIOUS

PDF

80.9 KB Created: 2021-05-10 22:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d138434252acaff4b3012fed95d2ac69 SHA-1: 5127e4f0765dab4393699b1e61807077a2008f2c SHA-256: 61062ca7c79a6da7d16e7c7bf7f48cd208a4093c9ab58f9eabf3fe6154735b16
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. One of the primary URLs, 'https://jacksth.ru/strik?utm_term=the+crown+season+3+episode+6+av+club', appears to be a lure related to a popular TV show, likely intended to trick users into clicking through to malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=the+crown+season+3+episode+6+av+club
    • http://dekiweragaf.mywebcommunity.org/80405322428.pdf
    • http://sifaritube.sportsontheweb.net/94438831606.pdf
    • https://sanawovixib.weebly.com/uploads/1/3/4/6/134653903/3312036.pdf
    • http://gekodejevotug.medianewsonline.com/ridarobe.pdf
    • https://bifuvabomefu.weebly.com/uploads/1/3/0/8/130814245/lugov.pdf
    • http://fomaxos.22web.org/resisovanokifak.pdf
    • http://fovoxarofej.getenjoyment.net/binulaz.pdf
    • http://waranijovuv.sportsontheweb.net/webarchive_to_converter_online_free.pdf
    • https://pinipinemijik.weebly.com/uploads/1/3/0/8/130814728/ca3c147dd.pdf
    • https://wopopodixela.weebly.com/uploads/1/3/0/9/130969383/ravoxodafug.pdf
    • https://static.s123-cdn-static.com/uploads/4463002/normal_5fedd5e22ae0f.pdf
    • http://xivazokib.medianewsonline.com/how_to_teach_dyslexic_adults.pdf
    • https://cdn-cms.f-static.net/uploads/4469634/normal_6047ea11de6e7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jenagubadopi/buzomuwevo.pdf
    • https://s3.amazonaws.com/mogipegi/464161429.pdf
    • http://zovoxasus.rf.gd/tamilrockers_movies_telugu_2019.pdf
    • https://s3.amazonaws.com/faluzotixupi/xoluniduwoxe.pdf
    • https://s3.amazonaws.com/dozore/82499382613.pdf
    • http://gozosowizopuk.rf.gd/how_do_i_change_the_battery_in_my_omron_pedometer.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_off0000fc05.bin
b4cfcc8ea26ab3d77fe5f098b0dcf7cad905a105317a59855d55cc820d85cc87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 5720 bytes
font_01_sfnt_off00010f82.bin
43fa93e6b423fc0b433b0338348c6e6d866b2a6445825284665796d23a060783		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F82 10996 bytes

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