Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df756f73f69035d…

MALICIOUS

PDF

149.3 KB Created: 2021-03-14 20:42:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 22de69eda77951c559a41a8cd69def5e SHA-1: f92a0458b6499ed736a5da68cd0cccc8361b5dc7 SHA-256: 1df756f73f69035d0f5046a02fdd300f52501ddc698582fda1fb0dbe4713cc14
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with several pointing to suspicious domains and one specifically identified as a link farm designed to redirect users. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a keyword search term, suggesting it might be part of a broader campaign to lure users through search engine optimization tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jumiwimov.ru/wix?keyword=eberron+airship+5e+cost PDF link annotation
    • http://suporefebakibur.mygamesonline.org/labaji.pdfIn PDF document text
    • http://nowuweg.iblogger.org/jerosulematazoserosefeku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466408/normal_601e0717028f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_6014b49e2fd83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486971/normal_6038448d0bb58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_60159f9330ecf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448339/normal_5fc8672c25eb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417309/normal_5ff0cc4f48990.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382186/normal_60020a2c8f0c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391327/normal_5feff3049c3d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a208f5-ced1-4b69-9aa0-8886656e4da7/xediwanabigefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642b6ba3-7420-47cc-8ac5-6e3298bc4e4a/fogibixekiv.pdfIn PDF document text
    • http://relivoziz.atwebpages.com/what_is_nsc_defensive_driving_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c38452da-ed22-4b25-916b-e913fd67d68c/robert_greene_40_laws_of_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad297eb9-453b-4c1e-8a8c-f1a87b1935da/48189143397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb50bc3-bf85-42db-9f70-c7af6d0eaf47/which_love_language_are_you_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09558422-ff37-420e-a344-9cc71c49f687/science_a_closer_look_grade_5_workbook_answers.pdfIn PDF document text
    • http://xukutiwap.epizy.com/fitted_sheet_pocket_depth_18_inches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffdd158d-a926-4dcd-9912-e268654573a8/ragnarok_mobile_mage_leveling_guide_solo.pdfIn PDF document text
    • http://xowilewegiwo.myartsonline.com/zimugoxusobowu.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_off00020ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20CA7 5212 bytes
SHA-256: c5001c2b68c53370a3eeba76b725aa8dea95fb172a27ef800c62456f2fd2a05c
font_01_sfnt_off00021e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E5C 11804 bytes
SHA-256: bd9ec130248a04d25988a2fdb3b8ceb3426ea0619f0cde76705c22aa213243b5

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