Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1c26b3906e08f7…

MALICIOUS

PDF

77.1 KB Created: 2021-06-11 07:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d6849ad2b20674adeaff9c4cad94481c SHA-1: 90e7a8187394fe8db948875f82ba51c24301ee31 SHA-256: bc1c26b3906e08f7d5f42d4aba45cf6807610fe38e7ef194e4fa49cc97aa9d84
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pistant.ru/pbw?utm_term=corel+draw+x8+keygen+download PDF link annotation
    • https://xesukalo.weebly.com/uploads/1/3/5/3/135311970/konuloxev_ketebekogili_kubibijetaga_bijumujiso.pdfIn PDF document text
    • https://doxeraja.weebly.com/uploads/1/3/1/8/131871607/2e92a730b.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/gewalidosano-vekezexud-fuxikubonogeda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_604e86043db46.pdfIn PDF document text
    • https://lobusejorul.weebly.com/uploads/1/3/5/3/135338183/guvumidaduw-regajivit-jipixemuxa.pdfIn PDF document text
    • https://kewegiru.weebly.com/uploads/1/3/1/4/131438086/beduxigavop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413468/normal_60660af5098c3.pdfIn PDF document text
    • https://mowibusox.weebly.com/uploads/1/3/4/5/134591082/tivuvowisalulobog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_60273ec8e2fa2.pdfIn PDF document text
    • https://wekowemawifov.weebly.com/uploads/1/3/4/2/134266616/voxup_ratakul_napitukufemare_pafiluta.pdfIn PDF document text
    • https://loloxanasi.weebly.com/uploads/1/3/4/7/134712840/tasux.pdfIn PDF document text
    • https://bizupewikanawa.weebly.com/uploads/1/3/5/3/135321725/nokatakasapo_narim_dojom_mifinofagumulu.pdfIn PDF document text
    • https://jirozonuk.weebly.com/uploads/1/3/1/6/131606844/fikojok-biteto-jokonut.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/02d0a239-53d3-42cf-9ddb-2624e1a771bb/why_is_my_kindle_fire_not_turning_on.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144871611/how_to_get_chick_fil_a_points_from_doordash.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f608a6b-3551-4c91-8cf9-eefe98a5c432/dogaxipusesexapofamev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/573cdd48-daad-4108-8bae-00a400fe7998/can_a_federal_judge_be_fired.pdfIn PDF document text
    • http://xibosini.pbworks.com/f/mofixulerobesuk.pdfIn PDF document text
    • http://wotasaful.pbworks.com/f/13_thirteen_2010_full_movie_online_free.pdfIn PDF document text
    • http://wikoborumun.pbworks.com/f/misa_de_requiem_francisco_palazon_partituras.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_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 5240 bytes
SHA-256: 5e7cc70e49626182a5ef6d67e2b9d22163a8c55499015f201f7a738b7b88c78d
font_01_sfnt_off0001039b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 10536 bytes
SHA-256: dd1b603113e945098e88962907f4645adc6cb6f6f4ffedeae395e68da2f7e295

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