Malicious PDF — malware analysis report

Static analysis result for SHA-256 0311d1d48a0d1436…

MALICIOUS

PDF

80.1 KB Created: 2021-04-27 12:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 47b424a0f5cec8790ad3d188f1da2165 SHA-1: 7fe19c71ae1fecf1cd1e581b7163e51f8f34c588 SHA-256: 0311d1d48a0d1436a9e65a69b6b24332af21f9c58e1498988654c14139cc9f19
146 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics, including ML classifiers and ClamAV, as malicious and phishing-related. The 'SE_CALLBACK_LURE' heuristic specifically indicates a callback phishing or tech-support scam pattern, suggesting the document's content is designed to prompt the user to make a phone call. While no scripts were extracted, the PDF structure and embedded URLs point towards a phishing attempt, likely using a fake invoice or subscription renewal as a pretext to initiate contact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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/strik?utm_term=sole+e98+elliptical+review PDF link annotation
    • https://cdn.sqhk.co/lupobikud/dy8hjfd/to_do_list_apple_calendar.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/9vihnif/charades_online_drawing.pdfIn PDF document text
    • http://lightstart.xyz/506611058072u7b1.pdfIn PDF document text
    • http://sonoxusa.iblogger.org/obligations_and_contracts_test_bank.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376380/normal_5fc70175e1072.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459185/normal_6000407a70e25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489848/normal_6000985c6f13d.pdfIn PDF document text
    • https://cdn.sqhk.co/gojinuma/ieqx4jb/70459554063.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/jovibibipuresozunuttr3lv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366661/normal_5fcd725a7d226.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/VQiWHJM/77957119628.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
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_d4c832e2ef01479bb18f92365152e700.pdf?index=trueIn PDF document text
    • http://zoruzinifade.epizy.com/assertion_and_reasoning_questions_chemistry_class_9.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_83a45b7acbdb47ec99e9533f9aef5524.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/gcse_exam_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/32580247247.pdfIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_96d536bd3e114bf6ae4f5e79f821c4c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/cloud_security_certification_free.pdfIn PDF document text
    • http://jojisoxig.epizy.com/pavivuduvakiporow.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/sufurugikewifejufuxinuvis.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_85627ad36a2448dcb1dd59c8caea9acb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/perurulexi/nujuvadarawosis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 5036 bytes
SHA-256: 1580867d124e310e17923c592599e47ff08f36b725618fa040f24e5d77a5d15c
font_01_sfnt_off0000fd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD34 11244 bytes
SHA-256: 79bb56fa330d0bedea05ef11b27d8abe2fb5d65eecd9c0248778beb24e526c37
font_02_sfnt_off0001236f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236F 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230