Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a397f96be3fc26…

MALICIOUS

PDF

69.1 KB Created: 2020-12-21 09:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 002666f11e1a2761fcf38dd003641a22 SHA-1: 73e4c6b549e6cf44eefe503642adf38eda5666df SHA-256: 76a397f96be3fc26f634007661ad58e6cdb56cc16844c29bd2ee455126839d55
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least one identified as a malicious redirector. The heuristic firings indicate this PDF is part of a link farm and is flagged as malicious by ML classifiers and ClamAV. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=anhydrous+ammonia+transportation In PDF document text
    • https://palozemoxapido.weebly.com/uploads/1/3/4/3/134366311/vugor.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/rusurukijugun_nonuxogape_kavesusi_gojesulemo.pdfIn PDF document text
    • https://sasegedowitigi.weebly.com/uploads/1/3/4/8/134895647/guligimogezalizatil.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/bopidoxeb.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/224ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fcee60965288022f4f57f26/t/5fd15fc58185f4776aff265a/1607557061468/meposizofoluroruriluzivar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa0b33a7-2f5a-4755-9c47-ade190908d69/12794713830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8c1073-2ebb-48f3-94c2-f58194d4f1f0/45031934005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a6af5b-80cd-46e9-9bd5-94bff8e2d1f4/ver_clave_wifi_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86f4cc4-2121-40a1-a91d-2472ef0ac111/99114581268.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e46f24b06a7eb3ff1788/t/5fc1f6d92dd96f591834bde3/1606547162208/lynnwood_transit_center_directions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce3eab49-7c66-41a4-8740-ced91958b174/isu_health_center_doctors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ce974d-5ee3-409f-96d0-f514722463d8/descargar_kingroot_apk_para_android_6.0_1.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_off0000d0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E3 5260 bytes
SHA-256: 6f7ba2944df8253dd32a9a4042add35f1738360ed19c606a4d357903d8050f28
font_01_sfnt_off0000e2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A0 10960 bytes
SHA-256: be7faee43a99059ef4a6d58a0d7cf05b954d3f86f415e14c5e4e9485dc0cc17b

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