Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef5e48a21046b2e…

MALICIOUS

PDF

71.2 KB Created: 2021-03-20 23:50:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 3bf0661466b893cef58f2b2c6df2d88c SHA-1: 7499e9774dbdbccfdadff02ddf962f6d459d0ac6 SHA-256: bef5e48a21046b2e380d310983a93cb3ce70edb20dc1d0136c159e649d437bbe
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying it as a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/wix?keyword=the+canterbury+tales+prologue+test+answers PDF link annotation
    • http://okclub.org/how_much_to_charge_for_mixing_and_masteringpe658.pdfIn PDF document text
    • https://pupadidaf.weebly.com/uploads/1/3/0/8/130873798/fokowaxom.pdfIn PDF document text
    • https://cdn.sqhk.co/kixowijeka/TXgeigo/egomanaco_livro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446395/normal_5ff9aa5a6921b.pdfIn PDF document text
    • http://greyfruit.space/timex_ironman_triathlon_battery_replacement_cr2025a970x.pdfIn PDF document text
    • https://fipoxojumudex.weebly.com/uploads/1/3/4/6/134649093/9992646.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383128/normal_5fcf86bd741dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_6025a4a45dc49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470523/normal_6031003d7d06e.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/RigAp8Y/98497454047.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/cylhcqe/296642047.pdfIn PDF document text
    • https://pixiguva.weebly.com/uploads/1/3/2/6/132681827/5268706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_6010622deffd5.pdfIn PDF document text
    • https://cdn.sqhk.co/powitaxixu/yyidhhR/26209116403.pdfIn PDF document text
    • http://new-volosi.ru/calories_in_dunkin_donuts_multigrain_bagel_with_veggie_cream_cheeseigbji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_890eca08a174406d9f3feba85fa5c734.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a48b70a1-eb91-4637-832e-fcaa6e9e386b/40183207851.pdfIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_5bc75a5c24e44f0f9e96cf90a8a3f1a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d13360e-f01c-46b1-a80a-77ecb7fd82e4/basic_mechanical_engineering_questions.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_c13795951ba843e795d238d744d4c286.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd94665-83d2-498d-920a-57eb8d63bff0/71084833068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dff98f9-080a-436d-9d3f-c0a621830a1a/22397207216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88d4aa9-10bc-4aa0-9ec2-6fc69e2f6119/25704648929.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_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 5476 bytes
SHA-256: 07669bef56d1e76ef6b59bd2eed0d4bc88ddcc1f1f4ce53ff3f21c6a70629d3a
font_01_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 10200 bytes
SHA-256: cbd0d4bbb546ef47439fb36dcefcaa3284d4db3323ad7f395e3f6a2e1cf102d8

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