Malicious PDF — malware analysis report

Static analysis result for SHA-256 7195dc80e537b329…

MALICIOUS

PDF

68.1 KB Created: 2021-03-11 09:51:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d6b8c973c62aca383873b2ab5b6b2dc3 SHA-1: 25922018380a3ef498c91d67675ff66e32ca283d SHA-256: 7195dc80e537b329c9f55fcc1c8b30594a4ece1821ea93b39d4cde72eaf555b2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains keywords related to 'worksheet answers' and authoring information from wkhtmltopdf, which can be used to disguise malicious content.

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://dugedepap.ru/wix?keyword=castle+mendeleev+worksheet+answers PDF link annotation
    • https://doxekitonibi.weebly.com/uploads/1/3/5/3/135326555/sujezobuzafojuzogav.pdfIn PDF document text
    • https://rixeludabigadak.weebly.com/uploads/1/3/0/9/130969597/5622365.pdfIn PDF document text
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/d341192b248d78.pdfIn PDF document text
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/ruxefuzuxapupex.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/SFiuijs/maybelline_color_jolt_matte_rust_love_swatches.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_5fd14d8962baf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_601c95d2309bf.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifoxunif/jedhdgc/how_did_the_age_of_discovery_change_maps.pdfIn PDF document text
    • https://biweworu.weebly.com/uploads/1/3/4/5/134525234/merexobutisikup_mapefalo.pdfIn PDF document text
    • https://fozivumi.weebly.com/uploads/1/3/4/7/134761275/judixigumonifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446036/normal_6017d4943d9d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489251/normal_601fd690eaa5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464861/normal_603066af1ec56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465269/normal_5fc8528da849e.pdfIn PDF document text
    • https://sejevijuwev.weebly.com/uploads/1/3/2/7/132712154/6857557.pdfIn PDF document text
    • https://baxorumele.weebly.com/uploads/1/3/0/9/130969728/9909237.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/axbLqih/fagasukajekijakawop.pdfIn PDF document text
    • https://cdn.sqhk.co/dirotiweze/tH6hchf/paris_concorde_crash_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416139/normal_601b1e9d4ebf4.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/ab8c2f1b-3519-42ba-848c-ac7b5f4b27d0/corporate_finance_institute_investment_banking_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e8e6712-ca7c-47fa-996c-9011a995651a/find_medicaid_providers_in_michigan.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_off0000ceb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB2 5184 bytes
SHA-256: 853a3c7c901b6e2afddcf44447d69228e2e43c6f2a1337d9c1aa51e17ea9f963
font_01_sfnt_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 10268 bytes
SHA-256: 9edfc8f722210f3a7f3d82d3d7478c13ab57ebb86110cc5b283f3a67a1ef4df8

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