Malicious PDF — malware analysis report

Static analysis result for SHA-256 253bdcd0e7a1c289…

MALICIOUS

PDF

82.4 KB Created: 2021-05-02 03:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bf3dde13c22ed627423d7d684a89d7f1 SHA-1: a9bceca2c1d7f0138bc47f245705019497da633b SHA-256: 253bdcd0e7a1c2893f70e7be0750b6b4fd3091da2e94232f70102a8f0da9086e
184 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and it contains multiple embedded URLs pointing to potentially malicious redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to dafemum.ru, indicating a phishing or malware distribution attempt. The PDF structure and embedded links suggest it is designed to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=summary+of+wings+of+fire+the+lost+heir In PDF document text
    • http://hydrofthol.space/paint_by_numbers_canvas_adults5edyz.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/7768317085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413467/normal_5fe8fbc629c9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412183/normal_6035a3581a38d.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/27627214292.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/logical_aptitude_questions_with_solutions.pdfIn PDF document text
    • http://zasazigupat.getenjoyment.net/84365224012.pdfIn PDF document text
    • http://songkfrk.site/sixudidivasipagozarevajiw4upv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459629/normal_606e29f50fe44.pdfIn PDF document text
    • http://wamabivunufoteg.medianewsonline.com/zupibokerabotaretegale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391903/normal_5fc9ac6b8d5bc.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/suxij.pdfIn PDF document text
    • http://segwaywheelchair.ru/new_pokemon_books_2020xrnx6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_0b284b420b62419cb57bceb2e86ad5fb.pdf?index=trueIn PDF document text
    • http://vefodipox.myartsonline.com/filamentous_fungi.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/rexedupezate.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_57f352803d4d43f6ad5a0591d5567f6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mizeteb/87718148101.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_946541af9e0f4074b46c944cdce534f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donake/walmart_black_friday_ps5_delayed.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_ac65b10921814eaf848476c773b0f7e7.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 5480 bytes
SHA-256: 94bab310632d1811cb0a1caa5e001a64d2987c886339ce451c1321f421b0d619
font_01_sfnt_off0001159b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159B 11284 bytes
SHA-256: 0baf0739e2aa729fc1e60847177c891f4e0357611a1716570e1b8efa1f54804a

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