Malicious PDF — malware analysis report

Static analysis result for SHA-256 970a9de6c10d8e22…

MALICIOUS

PDF

68.2 KB Created: 2021-03-19 20:15:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 351d5371763d34ee155e2a94b4c97ebc SHA-1: 0d00fcc1af092b1bd2856f82b0ca469c56a85733 SHA-256: 970a9de6c10d8e225deb7b2b4ee26520270dac3ed7c7e09384509a683818248e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to 'Macmillan english grammar answer key' and is associated with numerous external URIs, many hosted on disposable domains. This suggests a phishing or malware distribution lure, likely leveraging a PDF exploit to redirect users to malicious sites like 'kuzutuzo.ru'. No scripts were extracted, but the PDF structure and URI findings strongly point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://kuzutuzo.ru/123?utm_term=macmillan+english+grammar+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422145/normal_5fce8c3a75985.pdfIn PDF document text
    • https://jejusutib.weebly.com/uploads/1/3/0/7/130740078/gujogapi.pdfIn PDF document text
    • https://wonelapafilujol.weebly.com/uploads/1/3/1/6/131606162/1149565.pdfIn PDF document text
    • http://makipoduzoru.22web.org/92778324224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413347/normal_601bd457e2c72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375210/normal_6008557a2e9f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_602bb126186be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464065/normal_6021677f16d17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_6021f707f24e8.pdfIn PDF document text
    • https://jugoneworo.weebly.com/uploads/1/3/4/3/134307205/3564863.pdfIn PDF document text
    • https://mijutadozas.weebly.com/uploads/1/3/4/5/134590660/0155289c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_5fd3a55b66cd4.pdfIn PDF document text
    • http://rubivof.22web.org/navero.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/4256549.pdfIn PDF document text
    • http://viximer.iblogger.org/miller_bobcat_225g_8000_watt_welder_generator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/482654ee-bc07-4e19-a301-a360d2dc387e/2008_dodge_ram_5.7_fuel_pump_relay_location.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_b55eb565b4d64448ba08a6130b66aebc.pdf?index=trueIn PDF document text
    • http://popuzavefigud.epizy.com/7965878730.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_5466476fc9834d589fc8d5c36b8064ae.pdf?index=trueIn PDF document text
    • http://jezutax.rf.gd/ceftriaxona_dosis_perros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58ac4f42-4da2-4940-b4ea-7a1cef080b41/kigixegikefipumoduzus.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE42 5476 bytes
SHA-256: 17f3a8ed0863a9f6514ff42bf71a1d4d9f15e9ade318de5f187db30949a72813
font_01_sfnt_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 10096 bytes
SHA-256: 654129e935133e5653663ebec38b6781e865c6e5feed2124edc478bfe8b0d398

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