Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da592fdbd489f50…

MALICIOUS

PDF

104.2 KB Created: 2021-03-14 23:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6f97a53de85c36935ab906170fd6652b SHA-1: 4edd580a999baeef2514013aebf2bc00abce473b SHA-256: 4da592fdbd489f5046d5da52487637695d792e4f50cd2ed0499e18346877815a
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate effort to host many links on disposable domains, likely to obscure the final malicious destination. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/wix?keyword=unchained+monk+builds PDF link annotation
    • http://pixidilivutep.medianewsonline.com/25510857208.pdfIn PDF document text
    • http://wativeb.mypressonline.com/neserowisisiwodeminubama.pdfIn PDF document text
    • http://besefobusim.mypressonline.com/ladotedetopajanuzuxini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405651/normal_603c4f3e617a0.pdfIn PDF document text
    • http://sukovuxelex.22web.org/bayes_theorem_questions.pdfIn PDF document text
    • http://kimujedat.mygamesonline.org/web_design_company_profile_sample.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375699/normal_5fc94331cceb9.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/43369535173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453553/normal_5fd312e5f3590.pdfIn PDF document text
    • http://rezanufeku.mygamesonline.org/60054815584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470985/normal_603e29283da96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukorow.epizy.com/18162319227.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/asus_xonar_dgx_sound_card_installing.pdfIn PDF document text
    • http://tivekanudoz.rf.gd/thank_you_email_after_meeting_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2043cba8-0c6e-4279-8b66-88049c51198e/buxebawegekuwarekuwevuv.pdfIn PDF document text
    • http://bixodog.rf.gd/timusipixek.pdfIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_ce86d938f8b04d669eee22cd8c0f57f0.pdf?index=trueIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_2bbf5485dc42439c889196de0e7fe7f9.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_770e6f6b70564268a30714841fc7e0c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeea0791-65ca-43b0-8822-9863ea5bb0a0/how_to_put_the_lid_on_a_power_pressure_cooker_xl.pdfIn PDF document text
    • http://fovawipemezipu.myartsonline.com/33344603023.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_8d2327b6f1fe43ec890995d8fabea1cc.pdf?index=trueIn PDF document text
    • http://lujajali.epizy.com/73049228227.pdfIn PDF document text
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_d38c52c58341482c8ddd1405a6acdd36.pdf?index=trueIn 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_off00013bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFB 5276 bytes
SHA-256: a91d4a9e289b97de3fc1848d56521dc1cf8a71ecf2f83b6fcf5ad0766d382196
font_01_sfnt_off00014dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC1 1700 bytes
SHA-256: a2a592d7f3c19d5c7a9cd22bee3c2949d58e30f85cf180640836e2db01ff1c49
font_02_sfnt_off00015642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15642 11220 bytes
SHA-256: 9f5dd22a3af0b173879864fbb8b37b660165a9b5f2dada835e8cacd49acbe4a6
font_03_sfnt_off00017cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CBE 16344 bytes
SHA-256: f3b95f1269985bafc3dfb9b5b35e76df8a4d57039a143c013aed99c7cf3a4a89

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