Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a962bb6be7702e…

MALICIOUS

PDF

67.8 KB Created: 2021-03-29 21:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c6e63c9c4e394fd5fcd99d11c97db09 SHA-1: ac5228d94ff1f0c987f48db348928a2b0ac3e8ae SHA-256: 86a962bb6be7702e07f478b074535001fafe8f017c5606c776448d475d4d7c2e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://resalured.ru/strik?utm_term=marantec+reset+code
    • https://fupixadig.weebly.com/uploads/1/3/4/0/134096542/7769267.pdf
    • https://cdn-cms.f-static.net/uploads/4371003/normal_60102eba7ab17.pdf
    • https://lozatovetifeg.weebly.com/uploads/1/3/3/9/133999134/mesitugufumoj.pdf
    • http://lanejaselisipu.22web.org/police_reports_nutley_nj.pdf
    • https://sozobuxetezubu.weebly.com/uploads/1/3/4/5/134527793/dapavixavojipixujof.pdf
    • http://tifetatujuvib.22web.org/zikexefivolowejowaxi.pdf
    • http://pusedoropeseb.66ghz.com/break_even_analysis_template_with_graph.pdf
    • http://vixerixobo.22web.org/nerarozosanes.pdf
    • https://cdn-cms.f-static.net/uploads/4501989/normal_5fd71e0eaf80a.pdf
    • http://bilomibedaralo.iblogger.org/vujiwagon.pdf
    • https://static.s123-cdn-static.com/uploads/4408712/normal_5fcb60b8a2657.pdf
    • https://cdn-cms.f-static.net/uploads/4473645/normal_5fd2f44d0cd24.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vopuzed.rf.gd/ford_mustang_gt_2021_for_sale.pdf
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_d40f8a40c51c49fc93dda6053af780a7.pdf?index=true
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_3858eaec17ac45a2ae26ee8171b6f660.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5a6a610c-d339-45cf-8101-b98a2faf65d6/agatha_christie_novels_in_spanish.pdf
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_fe7a0489fe6b46e39d08cd749df6d8d8.pdf?index=true
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_0b4af23fe4274d20812d0964f2b721ea.pdf?index=true
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_975246c6a4f14ea0a3feab650102f3f6.pdf?index=true
    • http://puxuxuxatodoj.rf.gd/captain_ahab_white_whale_quotes.pdf
    • https://uploads.strikinglycdn.com/files/7be8ca1a-ae6b-42ad-8d67-5acb87fee4ff/cost_of_magic_bullet_at_walmart.pdf
    • https://uploads.strikinglycdn.com/files/2d5c7bf2-51d2-40b6-b23e-4ac28d1cc05f/how_to_make_a_herobrine_shrine.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdb0.bin
6ab5d23f4bb91651e8d68ceecad685b972d5c9847a75820608a576fb82317cd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB0 4904 bytes
font_01_sfnt_off0000de74.bin
78983e49949e966c004c9383a1e88dac863bb34a98496f66590dcaff1e0a952f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE74 10524 bytes

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