Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcf8acea0a2f189…

MALICIOUS

PDF

80.0 KB Created: 2021-03-16 17:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9fdcd7d6794fe68ae5d7109db7578946 SHA-1: 7cb587abe58479ac51da4acc42a350e957f20351 SHA-256: 8bcf8acea0a2f18964cff03b7219f614484a8e1fe243675aa2c8bf48cfa3c4f7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with 30 external links, many pointing to disposable hosting, and one prominent URL suggesting a get-rich-quick scheme. The PDF's content, though heavily obfuscated, appears to be a lure to external resources, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/strik?utm_term=how+to+get+rich+dennis+felix PDF link annotation
    • https://cdn.sqhk.co/gobonuzuwif/gigfGih/26732553462.pdfIn PDF document text
    • https://cdn.sqhk.co/mawodoso/dii9ifM/screen_stream_mirroring_full_apk_download.pdfIn PDF document text
    • https://pugotujokodi.weebly.com/uploads/1/3/6/0/136056651/8796240.pdfIn PDF document text
    • https://xofiguguja.weebly.com/uploads/1/3/2/7/132710561/jiziliro.pdfIn PDF document text
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/cea8f.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/Ehbihgc/best_sound_quality_music_player_for_pc.pdfIn PDF document text
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/17c971559429b.pdfIn PDF document text
    • https://cdn.sqhk.co/medefitama/Dggngcn/27044000474.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/e37114f2-4ecb-44db-9bea-ba2ccfff426e/sat_exams_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b671bd9-7c1a-42fd-b234-480a621cc7ab/xewesijure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b86b97ef-6c14-48a0-85b8-b21d0382d308/dd_warforged_colossus.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_2456b83b62da4806a0533f3d28ecf9c5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27ecab2-f711-409b-b3ad-e4e3360898e1/karane.pdfIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_b02bd05463684c2c95190833791d688c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fujadabez/cppc_public_company_limited_annual_report.pdfIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_09fd55e160624246bd124e76fe6ef501.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20b3ff7e-f0a5-4229-adde-d756d71aec35/demuz.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/arjun_reddy_bullet_bike_ringtone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaac2f94-f32a-483f-b595-2431255be67b/examples_of_high_school_chemistry_lab_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe280aa-8575-4fef-91a6-c1a3f5ecdeb2/99785851186.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/lukifufanolametelebutilok.pdfIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_ff2e751c2d894e72b70ac435a58dad69.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a3fa49-8e21-43be-803a-14aa0dee5403/nec_national_electrical_code.pdfIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_6dc0e7e56594403b92dcb25e895a77a7.pdf?index=trueIn 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_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 5196 bytes
SHA-256: 851d3d06fafdbf27db29e8410c5acb9467caabce2067d4394f5f2bf27bbe10db
font_01_sfnt_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 11204 bytes
SHA-256: ba2510647b87e3a06fe8391e588d1037665dc7d447fffbd7fd4e3bdcdcc1c276