Malicious PDF — malware analysis report

Static analysis result for SHA-256 7634b0c38fbcd672…

MALICIOUS

PDF

74.4 KB Created: 2021-03-06 18:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 373ceb30d979fe4e8786f8d47afc1b8f SHA-1: 4ea2793f1be75fb6ae40944a2d1f9f8305e614f3 SHA-256: 7634b0c38fbcd6723bc3287b9879768253f2ac5d6b568aa20ba9731875fceae4
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, masquerading as a furnace installation manual, which is a common lure for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious redirection.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/strik?utm_term=trane+xr90+furnace+installation+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450506/normal_601a0d4b3819d.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/8ujgGe8/41505146697.pdfIn PDF document text
    • https://cdn.sqhk.co/murefazomejo/APgighB/25345621955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_603ec000e604e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_6043276585621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480582/normal_5fd699792dbe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480594/normal_60391914eec79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469640/normal_5ff764f1e4c92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368955/normal_5fca5ccae74d7.pdfIn PDF document text
    • https://cdn.sqhk.co/vapumojemov/hgBrUME/terminator_genisys_future_war_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490953/normal_60380b2988db2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_600df717cdb23.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_1bb2371174ec43c590e4f4a54e2a74f0.pdf?index=trueIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_f801ea10d81e461283092980571b1c32.pdf?index=trueIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_2eeaa5db811c494eab5f8e072215ecbf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f536201b-f9a5-4232-9f8b-106838448d6e/gafozufetivogejijozigina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4f7a5d-9f10-47f1-aecf-d78926225bf0/tu_mundo_empanadas_allentown_pa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f8a6f6-ca24-4154-948c-2c37f7a703c6/landmarks_in_humanities_by_gloria_fiero_5th_edition_valencia_custom_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/540434c4-b8c9-4ee1-8fbe-acedd214e26a/linear_ld050_replacement_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/215dc460-f63c-4ea3-b1f9-27dc9f80921d/vekezejager.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_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 5344 bytes
SHA-256: a52ef77025825b30e0ce6b04fed4671e7743e110f8edf2fbd92f7cc87a088d21
font_01_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 11072 bytes
SHA-256: 59fbfc257b8d80f95a7ba3b17ee9f2230d18ce6eaecbb1798a4474cff9c780e3

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