Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb7bb7b73c23586…

MALICIOUS

PDF

75.2 KB Created: 2021-04-02 18:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bfb76ec0958522fa253e3ee183bcd837 SHA-1: 3ee48e15836fc1c313fc9be9e23bdf4c406abd6d SHA-256: 4bb7bb7b73c23586d8f34e0f243c9d09f9ae4ddaebb76d733aeb87c50314941f
126 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, potentially for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=eleaf+istick+tc60w+firmware+update PDF link annotation
    • https://cdn.sqhk.co/nujusowidom/fkwA7ja/rokojoganopobixas.pdfIn PDF document text
    • http://krokoboko6.xyz/analyzing_graphs_of_motion_worksheetsae01.pdfIn PDF document text
    • http://nupufuzomofima.22web.org/5585240558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_6049a0c2f2147.pdfIn PDF document text
    • http://proita.space/73662596100n7l91.pdfIn PDF document text
    • https://cdn.sqhk.co/tusadopovet/iHjjhjY/7895724107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461497/normal_605b2305e89bc.pdfIn PDF document text
    • http://bhd-management.space/occupational_therapy_clinics_near_meepkv6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_e56faeafdf924dfe9d7438074e9d85d2.pdf?index=trueIn PDF document text
    • http://xemusiginusepiz.rf.gd/assembler_plusieurs_en_1_avec_adobe_reader.pdfIn PDF document text
    • http://xatosizukav.epizy.com/cyberflix_apk_for_android_box.pdfIn PDF document text
    • http://kanabikovokes.epizy.com/catching_fire_book_setting.pdfIn PDF document text
    • https://704d67de-a0ba-412a-a77d-f8c4cf0d88a3.filesusr.com/ugd/a83d94_6b2a3ff86f5a4c1eb9d999ab7f434d1b.pdf?index=trueIn PDF document text
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_d6bbf51fbc6b4bc49402969e89f604b3.pdf?index=trueIn PDF document text
    • http://misujeguseb.epizy.com/how_do_you_spell_check_a_file.pdfIn PDF document text
    • http://tatikijoduvej.epizy.com/69950810248.pdfIn PDF document text
    • http://gexegufikide.epizy.com/95986733111.pdfIn PDF document text
    • http://gagonunanu.epizy.com/how_much_does_the_average_graphic_designer_make.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_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 5708 bytes
SHA-256: 9957623b28807c20650ea146611029aec09ad37ea93ffb3d6ea19d3851b78e8c
font_01_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 10572 bytes
SHA-256: d372ac136d029ed39bab8098c97c70c42acf3aab9f55aa58c673793a5f58cfa7

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