Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72d2874c7a90e93…

MALICIOUS

PDF

85.1 KB Created: 2021-03-31 08:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 67b124c9b5b14e21ee2018c544c7dc6d SHA-1: e89fba47a7ffea2cc92dac7f36b0c4b521ea5adf SHA-256: b72d2874c7a90e93cf01be48a4d608eba66e24dd436fc25debbcc22416c81e27
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 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://resalured.ru/award?keyword=aeronautica+imperialis+pdf+vk PDF link annotation
    • https://cdn.sqhk.co/jomububorava/6jiLWie/kewikaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495974/normal_6042d2111b10d.pdfIn PDF document text
    • http://mylevel.store/887165382303jea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477369/normal_60346225960f7.pdfIn PDF document text
    • https://cdn.sqhk.co/kezagajasiw/gUgfUhe/ekg_interpretation_cheat_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/rejibebadit/Phfifgf/bulletproof_problem_solving_free.pdfIn PDF document text
    • http://zonafuluza.iblogger.org/arduino_cnc_drawing_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/guvawatuzax/giqughZ/littlest_pet_shop_your_world_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_600b787d544da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453906/normal_6055450c976a1.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/heKgd71/dreamers_and_schemers_coupon_code.pdfIn PDF document text
    • http://dkblogin-de.best/pobuporupadqfh22.pdfIn PDF document text
    • http://imedo.ru/71320637665spb8r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495841/normal_5fede3bbdcca3.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://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_ad82deb6ae7346c0beefeabec23004bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d5e01b-1ccc-43e2-8800-e53a0dec8a91/60381324455.pdfIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_d817298f2abb4d2b831d63029f9e8518.pdf?index=trueIn PDF document text
    • http://tonubugiloroluv.rf.gd/62686494588.pdfIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_b13955cfc0034cf58871c3f51b8a1cbf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ce8766-b278-4ca4-96af-950cb3cc943f/fawire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fd140d8-6aa7-4804-aaa9-0c85288d0b76/55300055055.pdfIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_563db46ea8e04e0b86e2f1135be4425d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03cd8a34-6023-42ef-b764-1c8ab0c56821/74118164308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b368701-ea3c-49fb-966d-cc6ff9a2ac46/gususunirasuz.pdfIn PDF document text
    • http://mozizilusonasij.epizy.com/39056892.pdfIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_5aebada0ceef4dd8924c12e7945e479e.pdf?index=trueIn PDF document text
    • http://vabitiwobunena.rf.gd/most_common_synonyms_and_antonyms_list.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_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 5296 bytes
SHA-256: c55225b07f0151318249b7dc8d25caec5b09750a6b5a0b5c6a8c0c2d8243e798
font_01_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 13852 bytes
SHA-256: 6dbf1e1efa98ccbc7847388623388556c9a9eb18b1735a1337847f1d6746d045
font_02_sfnt_off00013743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13743 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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