Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17f1869bb362731…

MALICIOUS

PDF

77.2 KB Created: 2021-06-07 18:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8e17675287bfa064ecceb2949b57e64e SHA-1: 6a075cce0afc86f18e0ea347c86d61f7a3ee888d SHA-256: d17f1869bb362731d8a8d575832fbfb06d8406a110961bfb096455a849413725
186 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm, with numerous external links. The primary URL, 'https://crewmak.ru/pbw?utm_term=how+to+fix+a+biddeford+electric+blanket', is presented as a guide but likely leads to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crewmak.ru/pbw?utm_term=how+to+fix+a+biddeford+electric+blanket PDF link annotation
    • https://nutuvujupakumap.weebly.com/uploads/1/3/2/7/132740288/a940cbe166e.pdfIn PDF document text
    • https://ritewelikuwu.weebly.com/uploads/1/3/4/4/134493798/1d44d72dece.pdfIn PDF document text
    • https://fupefomaxoxaje.weebly.com/uploads/1/3/4/8/134897629/baf2a2c.pdfIn PDF document text
    • https://gevexewu.weebly.com/uploads/1/3/4/0/134018209/3378184.pdfIn PDF document text
    • https://lixevipilevorox.weebly.com/uploads/1/3/4/6/134634278/de6aa3ab.pdfIn PDF document text
    • https://xoliguzi.weebly.com/uploads/1/3/4/2/134265359/7142295.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/gedunin-pavokos-bigaxuf.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/8231ae3b-bf51-4fc4-b93b-772c6f02c15f/managerial_economics_and_financial_accounting_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b20536b-f70d-4401-87f2-dcb25fe5e442/quran_english_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19bb0c2f-c177-4416-997c-1f8b0b2964f3/3387496123.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144416013/xezavesuvipepok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1fed588-2138-43db-9693-926a9b697fb8/narutanifegewopidori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f87b47b6-0397-4cac-8c11-5007d4f6c6f9/tibisiwataludetumuriwipel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4db66fc7-ab24-4802-8042-6bc7fabcc553/mejutoluwekajivosuso.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/what_are_the_functional_regions_of_a_neuron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e873c8-cb9f-4382-bfcb-53969faae970/14399259474.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/why_the_hell_are_you_here_teacher_unblocked_reddit.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/pemopanitewilupuregosa.pdfIn PDF document text
    • http://kumarifili.pbworks.com/f/aurora_3d_animation_maker_free_download_for_mac.pdfIn PDF document text
    • http://vajaxasave.pbworks.com/w/file/fetch/144459903/53459759096.pdfIn PDF document text
    • http://pezeliv.pbworks.com/w/file/fetch/144423882/81082388995.pdfIn PDF document text
    • http://vakerul.pbworks.com/f/what_is_pass_with_flying_colors.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_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 5164 bytes
SHA-256: a5b05aa68dccb69a9c695eb11f30d14da4c8a1baf654809f5080e09adce08d1e
font_01_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 10756 bytes
SHA-256: 6ac74043726553a12bf233481a1c7983b33f370f047d2f976393cecb899f846a