Malicious PDF — malware analysis report

Static analysis result for SHA-256 552572d83cf4c8e1…

MALICIOUS

PDF

72.5 KB Created: 2021-04-01 12:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b42316b78903b8b382e448f6a78c4a74 SHA-1: e2633bffc31cde06e8d71feaf7f150a8a5a1ed6b SHA-256: 552572d83cf4c8e129bbc5f4bb570c7c4357a58931a8f9f88138505f1d2ca8a8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=2017+union+pacific+study+guide+answers PDF link annotation
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/nakapoxodov_dazewo_dufiwiguvova.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379230/normal_5fec7ade49baa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388157/normal_602426c0b4d80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495558/normal_601f2f5b88464.pdfIn PDF document text
    • http://tuvosudokalidu.scienceontheweb.net/banomewufowifewesof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472208/normal_5febf97be0b6a.pdfIn PDF document text
    • http://blue-tick-central.com/50636185707a9ois.pdfIn PDF document text
    • http://myshoes.moscow/100_chart_blank_printables06dk.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/64427189804kqff5.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/74514876391536h.pdfIn PDF document text
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/fojupogox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_604b1128b4e99.pdfIn PDF document text
    • https://moxeguzivega.weebly.com/uploads/1/3/5/9/135965209/6149421.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/57072850453.pdfIn PDF document text
    • https://zegabanibo.weebly.com/uploads/1/3/5/3/135339571/gojomorijidebo.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/d18f7f03-6f26-4ded-be14-797236eaa332/tusitafimetomisotuwuraxov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ed21ccc-0641-497f-81c0-15cbe496d966/lust_by_susan_minot_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8dc9a0-69a7-4372-bd28-2d476177806c/what_do_the_word_tantra_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a09d396-6732-4cf5-8d55-d11b54c69d4f/dark_souls_3_boss_weapon_matchmaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/538f8bda-adfb-4267-9408-a600ca79f819/crossfire_series_sylvia_day_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb27a79-622f-451d-8074-a2c6d44b8315/apc_back_ups_es_550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a24d3aee-c8b3-4e6b-9902-0c131b9e8ff1/logo_design_ideas.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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 5796 bytes
SHA-256: 732a03b24eb1c0b62fc337456372a7e3374b9236eb8d51d1aa1e7be55f054ac6
font_01_sfnt_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 10840 bytes
SHA-256: 5650beac26d1531452bedb1e4abd268452ee5a7cbf2a615304d537591a32df67

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