Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90ee6f56691bb06…

MALICIOUS

PDF

78.8 KB Created: 2021-03-31 19:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: eb66d6076d8608fb159e1a545703e306 SHA-1: dc895372bc73e4a2cd1de86b8572386937746587 SHA-256: d90ee6f56691bb0690405a665f3f8d3d5255093793f223481ae201c71b44d8d3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/award?keyword=catholic+social+teachings+pdf PDF link annotation
    • https://wawotisusuwo.weebly.com/uploads/1/3/2/7/132741293/3486054.pdfIn PDF document text
    • https://piwomokoxik.weebly.com/uploads/1/3/5/3/135335333/4916484.pdfIn PDF document text
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/xuwaxutuvekimuvowewo.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/19819020842trm76.pdfIn PDF document text
    • http://trackcreditscore.info/oscar_ballot_2020_printbt3u3.pdfIn PDF document text
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/nesadib-pogaweluribi.pdfIn PDF document text
    • http://center-san.ru/schools_that_offer_interior_design_in_philippinesfkdmt.pdfIn PDF document text
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/bosiza-gurilamuwanijov-nokakegu-reromozup.pdfIn PDF document text
    • http://aazzzry.space/sigivonegidozaxuzaxq9y6o.pdfIn PDF document text
    • http://wersita.fun/43118531782aawq8.pdfIn PDF document text
    • http://zawubitukete.22web.org/passive_voice_all_forms.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c3490b-feee-4e5b-8e0f-c644dc69c54c/how_to_program_a_radio_shack_digital_trunking_scanner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5951e42-2b7a-45ef-a310-e0712d9e00ca/manual_para_tocar_guitarra_para_principiantes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8350cd2e-a938-43dd-b64f-81040ca82773/fudoxol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b775316-45e8-40b6-afa3-7ae74cf2eb2c/37697542469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/894d86c8-08da-4bf6-be1e-ce4de0283261/kozazozuzido.pdfIn PDF document text
    • http://jamebixidi.rf.gd/gopanujoriwowuzepoge.pdfIn PDF document text
    • http://kitosigefowo.epizy.com/kuzewisawexumoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20b9e563-827e-424d-9aca-5009fa811cf9/competency_based_interview_questions_with_answers_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e56e7d-8c2b-4e8a-ba62-9a29e8ccc96f/31504251374.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_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 5228 bytes
SHA-256: c34266131c763dafcd02f5be680c3f2c22eb319037a68e704596f284fa7b5753
font_01_sfnt_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 11048 bytes
SHA-256: e11797f65ae0894325e737a1969a36e4ba78c64b0634459c4b6b0ec84158e7ca

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