Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d410d32b122b4e4…

MALICIOUS

PDF

87.4 KB Created: 2021-03-24 00:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fd6eb921f93a50c2da25c011522aa050 SHA-1: 2bba609ccb874c222570ede79e16c3db70bd59be SHA-256: 8d410d32b122b4e4a826b7089e2d055e10c8c4747281ba4b4636f9d2412e7a76
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, flagging it as a phishing trojan. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://midufefew.ru/strik?utm_term=what+is+the+mood+of+the+cask+of+amontillado', is particularly suspicious and likely leads to a malicious payload or phishing page. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=what+is+the+mood+of+the+cask+of+amontillado PDF link annotation
    • https://zugavalomiseba.weebly.com/uploads/1/3/6/0/136082075/3598018.pdfIn PDF document text
    • http://mekozeka.66ghz.com/solar_mobile_charger_circuit_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/xobupiba/iiDgcHB/spiritfarer_recipes_museum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366407/normal_5fdd89ec82855.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/cjbicjg/funny_barrel_racing_jokes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490140/normal_601426c158750.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/awIiakT/knights_table_stainforth_christmas_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/zgdihnB/minecraft_survival_guide_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/dghhjgg/asana_pranayama_mudra_bandha_bihar_school_of_yoga.pdfIn PDF document text
    • https://cdn.sqhk.co/nomowaxiwo/chc4Mid/world_series_champions_dodgers_hat.pdfIn PDF document text
    • https://dosupara.weebly.com/uploads/1/3/1/3/131380612/zavatumorarew_feroperabenodu_davivemutareba_fopotidolamis.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/jd1zNPP/61010466960.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/ijia6jb/final_fantasy_iv_ds_review.pdfIn PDF document text
    • https://cdn.sqhk.co/latosagax/Jheiiid/vice_president_debate_2020_highlights.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/qBnXnji/japeterofitun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459025/normal_6042ecfd2492b.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
    • http://rinonefor.rf.gd/bugowizozirafeginejaxuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cd6c6c0-1456-40a7-97b0-684e694f5964/torisat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0352ef14-b0b8-48ad-8e9f-086f74e0499e/37355833580.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 5028 bytes
SHA-256: f90f315b26a0933a63075cff393b051f4c957a95ac1f8a47f99d2c5264422ba0
font_01_sfnt_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 12072 bytes
SHA-256: e9a8657f2198460859ceb39d517d8b3ec8ba457f66d042304968f1f26f8fbee9
font_02_sfnt_off00012a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A43 16280 bytes
SHA-256: 5127f88e162ba8f9b233b53a9edcbe0a682cffc44867fd563e7aba2e6f074dd2
font_03_sfnt_off00013fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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