Malicious PDF — malware analysis report

Static analysis result for SHA-256 734ffa22b9d146d0…

MALICIOUS

PDF

128.4 KB Created: 2021-06-01 20:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b5914e0d7c6ed461a1968cda2bc4ca6b SHA-1: ddfeb401841aedb887a10fc1bbdac0ad490f8c47 SHA-256: 734ffa22b9d146d02695c4aa49c9343790e8403a9dd66b9bfa91c23d79cfbf6d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://krisoc.ru/pbw?utm_term=why+netflix+cancelled+chilling+adventures+of+sabrina PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365551/normal_5ff24a8972b1d.pdfIn PDF document text
    • https://xogepavawoda.weebly.com/uploads/1/3/0/7/130740110/nuwemofijowakunarati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_6052523fe8cba.pdfIn PDF document text
    • https://pituxujufu.weebly.com/uploads/1/3/1/8/131856071/7825529.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453909/normal_5ff0c34550ab2.pdfIn PDF document text
    • https://fatuvubexu.weebly.com/uploads/1/3/4/4/134496757/c716f2235b5e5a.pdfIn PDF document text
    • https://pulijapejupexeb.weebly.com/uploads/1/3/4/0/134041872/6940655.pdfIn PDF document text
    • https://tazaliraku.weebly.com/uploads/1/3/4/8/134884946/fidukaj-fusikik-zusinurukexafer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_602d2960cce92.pdfIn PDF document text
    • https://lozofedexipa.weebly.com/uploads/1/3/5/9/135969573/tutezizobobuzapebiwo.pdfIn PDF document text
    • https://razitesewiwi.weebly.com/uploads/1/3/2/8/132815022/1291549.pdfIn PDF document text
    • https://xumiwuwazugeri.weebly.com/uploads/1/3/4/4/134444831/riwaxobubek-fagadifizogo-tiwabof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_6032caff4a228.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://savavaze.pbworks.com/w/file/fetch/144453192/awesome_cars_your_unblocked_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f6d6a0-6fe9-4905-b4c3-89d17aab0113/6067542292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85242324-c512-462f-b228-03146c7e9210/1239969612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56031ea7-4457-46e7-af2b-5f255dda9168/13244579478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ac5c1a2-1839-4c8f-9bf0-700783af7d91/how_to_set_up_a_blackweb_universal_remote_to_a_element_tv.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/20988432448.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18348 5664 bytes
SHA-256: 6312d3a7ef034f2a2d53f0e87d92adb17cacc7b37b0e7227d10f10d5feb1da09
font_01_sfnt_off000196a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196A3 8436 bytes
SHA-256: 67df4d4cde1befc223671f3400d76d007663ea90421f755c94a9708cc8b08317
font_02_sfnt_off0001aebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEBF 12368 bytes
SHA-256: 32bd6ba5cee371b11a0ed00830204ff8e776c29457bd3b4cb1bef1c729d82850
font_03_sfnt_off0001d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D88D 17040 bytes
SHA-256: d5540fa72c52db0c9a104ff3eedc6bf35eab04821c226447f492768c18b38a94