Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1043ccb2aee46c7…

MALICIOUS

PDF

84.7 KB Created: 2021-05-18 14:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 593494069f49d331f9b13fc810853726 SHA-1: 76f6c45d060d725380813a555ed687095a487008 SHA-256: b1043ccb2aee46c7a710eab90334bffadde971d552c39664e98781405d320f1a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting or domains with unknown reputations, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 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.
  • 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://zajinet.ru/strik?utm_term=best+weapon+blueprint+in+dying+light PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491933/normal_60293b66a71a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_601ba836d6455.pdfIn PDF document text
    • https://kofijowuz.weebly.com/uploads/1/3/4/4/134446653/f6596f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379720/normal_5fce7759865cb.pdfIn PDF document text
    • https://kijidagidopijub.weebly.com/uploads/1/3/0/7/130776406/1411281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_60177e8b4aa33.pdfIn PDF document text
    • https://durafozo.weebly.com/uploads/1/3/0/7/130740533/dovarefesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470962/normal_603e4d64b630f.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://uploads.strikinglycdn.com/files/8ef8fe13-2e5d-4058-adf0-e213e11ab1af/99019938608.pdfIn PDF document text
    • http://buzuvemujogumob.epizy.com/75148367084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc4bfcf4-283e-4648-a3fa-792331b1b195/loxudaguzakomokalagenok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57989951-a4c5-4831-979a-e20239ca333e/99905155229.pdfIn PDF document text
    • http://sakamajuxuga.epizy.com/alphabet_printing_practice_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb8226d-5d38-4742-b14f-6cf5e46daca4/brother_hl-5370dw_printer_driver.pdfIn PDF document text
    • http://puvusevakap.epizy.com/45717549990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/913472d3-0d00-45d9-acff-f070e9156558/vivoxudupawosegubufosutuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301644f0-8711-4094-a5cd-dd9bfa377b57/1280_x_1280_aspect_ratio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8d85d9-2846-4570-a355-9b116bc9889a/what_causes_my_washer_not_to_spin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e15da951-c326-451f-bed9-16802bbbb251/zupaxuvorepenis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/486c3837-cf71-42e3-b35b-18301ad3a64e/pasewojitinipakikuvewid.pdfIn PDF document text
    • http://wefulipov.epizy.com/vosatokifitijobuneruzole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73132036-52c6-4dd3-b6db-06be4c5e4f1e/foscam_fi8918w_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/176bf5bc-bdd0-48f5-b879-29e775fd03fe/zevexeliketugobujegigof.pdfIn PDF document text
    • http://tixinova.rf.gd/99501010320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03372fc6-c223-44b2-8b30-725e7568e00d/bosijajep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec9bcd92-2edf-4457-90bb-fb1bec562849/8929925761.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_off0000fc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 5488 bytes
SHA-256: eb3a697b84afb8ea52897dd50f5652b70a4405d901e9f8f988182d77d35d82d7
font_01_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 11828 bytes
SHA-256: 608963207f9cd88ec84384c7049ab085d727427cfa8650a7e2defaf258a3e4e4
font_02_sfnt_off000136ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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