Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d8194b8c7a1658…

MALICIOUS

PDF

55.8 KB Created: 2020-10-30 09:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3836696de6ec2515d4f9c37f258f3cba SHA-1: 7fa971723e1dad98db68bbb919eb29560742892f SHA-256: c9d8194b8c7a1658f5a0be05a896dfceb6b7a0ae4851b1484a42ffa5f32114a9
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially obfuscated, contains text suggesting it is a service manual, which is a common lure for phishing or malware delivery. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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.
  • 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/strik?keyword=canon+d1350+service+manual In PDF document text
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/zadujidep.pdfIn PDF document text
    • https://lizotolagodega.weebly.com/uploads/1/3/4/4/134495854/dogiloger-xogiseguz-lubezeman.pdfIn PDF document text
    • https://dowikonusinewe.weebly.com/uploads/1/3/4/3/134374018/sejadiguv.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/kuxazi-podot.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/335325f396e211.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/pewiredegaka.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/mipexuma-pixifajuzi-pavusibetiva-zowedare.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/6183b1fb-f866-4e00-a333-d89272f22f19/kekokusedejogipivujuwubas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f0713c2-851a-4729-9b10-30cd877e87f8/51342472736.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9918/4022/files/wifi_hacking_apk_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6416/2969/files/gregorian_calendar_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f84cebeb-3b1c-4150-a87e-c30b8c31964e/taganonedajin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d22a734-ed68-4394-88b7-5401fe101c32/96548935990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eefdc573-aa25-4a08-8306-d1630627db85/23605917561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/286ac7ea-54d8-43a7-bc2f-b2fa3f0b5d42/mafia_3_herbalism_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000622a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622A 17556 bytes
SHA-256: 7332cf9b2550f228e3c6e868bb5cf3650a48e9d5499e1cd33944599788a30a7f
font_01_sfnt_off00009ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE8 5532 bytes
SHA-256: 7da633b255e2729018e8c461b42f47f380d9a5071cb2529e896348074d80d484
font_02_sfnt_off0000adab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAB 10540 bytes
SHA-256: 73bb56a1121457c0c0667da3b5029da60f3726a66c7548d3062f34cecd683927

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