Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8b1c6c4d1e8d1f…

MALICIOUS

PDF

79.0 KB Created: 2021-03-17 00:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d66928b2a7f0198b00c8d65ef6fea2bb SHA-1: 34333f4026d1906c05a4e3aced5a4444b0ec2ba3 SHA-256: 0e8b1c6c4d1e8d1f43d307a1effdbd2d21d66f1a12353b74a6e71c08b6b0b1d8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded links, with a high-confidence heuristic identifying it as a link farm on disposable hosting. One prominent URL, 'https://ponafet.ru/strik?utm_term=how+to+share+facebook+memories+on+my+day', is flagged as an external URI. ClamAV detection as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and an ML classifier output of 0.999712 strongly indicate malicious intent, likely phishing or malware delivery.

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://ponafet.ru/strik?utm_term=how+to+share+facebook+memories+on+my+day PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462732/normal_5ffbc8b8b6ea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_5fd1df099fd55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486365/normal_6037234c91c40.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/how_to_reset_a_kidde_smoke_and_carbon_monoxide_alarm.pdfIn PDF document text
    • http://polnews.xyz/clover_food_lab_apple_payrpxvc.pdfIn PDF document text
    • http://soul-felt.com/48542918777i76q1.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/what_does_pyramid_head_represent_in_silent_hill.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/chicago_manual_style_in_text_citation_website.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_fb66b1dbe69645b88ceedc1e8b8e9985.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/sda_bible_commentaries_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/12305180193.pdfIn PDF document text
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_1257ca61c3d14308bf7065ef7692e82c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14485ef0-542f-4c63-b750-ad33c88035a5/how_do_you_identify_textual_evidence_to_support_a_theme.pdfIn PDF document text
    • http://novogizeboje.myartsonline.com/motobijuxelaketaxigupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c418026-fee9-41d3-a508-b384809bc864/57888300925.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/alba_botanica_anti-_acne_sheet_mask.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/79176836992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f710330e-89e9-41a4-9a32-f992e6a3a770/bryant_furnace_troubleshooting_code_34.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/399d1b60-7dfa-463a-bb84-37411f0d149f/4157921751.pdfIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_a1b156831366433cbdd9b4bd60fbc1c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bbbf6c0-ed2b-4415-a684-919ca15d266b/24059501137.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_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 5588 bytes
SHA-256: 37dafc165a5a8cc7610819ed885464d5e13a1ec49b4772ac89508bf9af06ecd0
font_01_sfnt_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 11208 bytes
SHA-256: edebe845963457996f172544b5c4edaaf75de38060dadbaee30985cce74fe85e

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