Malicious PDF — malware analysis report

Static analysis result for SHA-256 6622674b254b7a87…

MALICIOUS

PDF

102.2 KB Created: 2021-03-18 09:31:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d4e72b4997f4c81dc13aaa1fa66e8bf1 SHA-1: cd793801af948cc6fab53e7776f9d00a8fe7d154 SHA-256: 6622674b254b7a875e2b2207cf3714942d78add1cb176c2fba192e610585272d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/award?keyword=weight+training+for+swimmers+pdf PDF link annotation
    • http://bubuwem.iblogger.org/abide_in_my_word.pdfIn PDF document text
    • http://trujillostacoshop.com/95894148817cibfe.pdfIn PDF document text
    • http://korecos.ru/74342554612154ml.pdfIn PDF document text
    • http://bitsracing.net/xaxidumaberazo9rsmh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_d181d91a5a524ce4b48ee74c4d7971af.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_510af9c19ea249be9ece01bcb9808b00.pdf?index=trueIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_4fe6ee4d658345f9aefb991c67e96cd6.pdf?index=trueIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_013a142a689e4f3fb424d9e75e0c201d.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_b3510f1af23b4de184d317846e5f36ad.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_a13c495f731d4414ae0e93e0da7012d3.pdf?index=trueIn PDF document text
    • https://a6668164-4238-4e0d-addb-cc4c62f58fca.filesusr.com/ugd/2dfcca_20d3eaa62bf14f52835a9fe63ebb400f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/pubitotipawuzox.pdfIn PDF document text
    • https://ba61e3a9-0170-4458-a4eb-726ec9d21161.filesusr.com/ugd/f9d4cd_a63290b0b1f944e289728dec2f27864c.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_161d6ec517a340c48e9f7f8e7c5444c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jijari/botines_plataforma_negro_pull_and_bear.pdfIn PDF document text
    • http://mofibukuzoke.rf.gd/advanced_information_technology_test.pdfIn PDF document text
    • https://4c38db24-2924-4bf2-81c9-04860d987a69.filesusr.com/ugd/a68d8f_1fe18d4112844de6847fd9d7c74032fc.pdf?index=trueIn PDF document text
    • http://xafonabikox.rf.gd/celestial_navigation_work_forms.pdfIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_ddec6a0625a14aed8f5e86e09002c05b.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000144fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FD 5316 bytes
SHA-256: 2546ca6bba5fec8a5ccc16166a24289435325886cf0a5c5fdd841f28b1ce551a
font_01_sfnt_off000156ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FF 10924 bytes
SHA-256: 16d9eea9aae4aa6141bb2b365d6914052d39082cb0bf5c160e0526737eca66fa
font_02_sfnt_off00017bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BC4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378