Malicious PDF — malware analysis report

Static analysis result for SHA-256 6894b9f89bb1e9fb…

MALICIOUS

PDF

86.6 KB Created: 2021-05-19 07:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f481675e04d8934eda605bc17231d78e SHA-1: d7d9bd80b545164ca2f704c46e005e113780d52a SHA-256: 6894b9f89bb1e9fbd63551745f900ed682ed18f19517a4bca4a7ca2021cc60b0
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to deceive the user into clicking these links. While no scripts were directly extracted, the presence of numerous external URLs and the ML classifier's high confidence score point towards malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pelibifir.ru/strik?utm_term=sad+heart+broken+status+video PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453579/normal_602444cdbaa6f.pdfIn PDF document text
    • https://xowiwive.weebly.com/uploads/1/3/1/3/131398234/temagamu.pdfIn PDF document text
    • http://talejeripubala.iblogger.org/sensory_integration_occupational_therapy.pdfIn PDF document text
    • http://dilomevoje.22web.org/what_is_the_difference_between_swing_caddie_sc100_and_sc200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_6025965141427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369187/normal_6008275522411.pdfIn PDF document text
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/d04cdedbc15.pdfIn PDF document text
    • https://dimomivij.weebly.com/uploads/1/3/4/5/134504604/0926c08.pdfIn PDF document text
    • https://pibezenasa.weebly.com/uploads/1/3/1/4/131454503/kovavazezalanululab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_60596d3b9db45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5fc5d96112637.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8d3fa7bc-842a-499c-87d2-d6cfbefe0438/iso_27001_lead_auditor_study_guide.pdfIn PDF document text
    • http://mulazukaga.rf.gd/championship_manager_windows_10.pdfIn PDF document text
    • http://lubozogemodusa.epizy.com/pujaziridu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe004ab-5ef5-4d89-9875-515047ecf18a/sagafumip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc4c6e8-09d5-411e-b99f-b0349eb9c5cd/41440827641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f0f40e-f3b7-48b3-8daf-8547be4895e4/wd_tv_live_streaming_media_player_remote_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4bef8c4-07d3-4f6d-9974-57f4eb242d85/honda_gc_160_engine_oil_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2f10fc8-fdf0-4987-9589-a9c4e3b5f9fe/keketejozarifibogotiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b0ba209-439a-49b5-87c3-a4498db3ab03/48617351406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df65f965-c851-438c-9d75-2c3528a27e4c/nitil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c8676d2-65a9-4513-92da-97d820330623/43573079228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27f2dfd-e26f-466b-8d12-3b80799acea1/paruron.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_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 5128 bytes
SHA-256: 7dc71c7e7ff94919f4a92f7be8228aaa7a4788201a87445902c45fb0facd915d
font_01_sfnt_off00011a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A08 10832 bytes
SHA-256: b5ed91d86667752becd7f979d8351c4923487edbbf451fb2db7a87054892ddec
font_02_sfnt_off00013ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE4 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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