Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f99e9b46369b37…

MALICIOUS

PDF

84.8 KB Created: 2021-04-05 04:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6c180d1a69dea57174b8ca22180a469d SHA-1: 8bdb120996f6690aa241c7acce6f19604aa79c46 SHA-256: 79f99e9b46369b37b6346656087555d0f49452884cbef26a0a3f5aadf337d421
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 0.9998

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://nipisod.ru/strik?utm_term=which+lens+is+best+for+portraits PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481841/normal_5ff0e439653db.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/lavesuluvokiti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427282/normal_5fde716de44ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_601b427fc1dd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_5fda75eedf561.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://melewurimepuja.rf.gd/kujuginudaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eda8c444-3c5f-4289-8fd0-ab1f1138485c/52210429217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cadae14-a44a-4dca-ad89-3cd0c7b427b4/of_mice_and_men_quotes_about_loneliness.pdfIn PDF document text
    • https://536432c6-7160-4795-b32c-faef63afc1c8.filesusr.com/ugd/5e2347_e3961e25be3043c5a1a64910365269bc.pdf?index=trueIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_b6dca07f35dc4e4c9d8f4feb1d0c8a60.pdf?index=trueIn PDF document text
    • http://larisakexifa.epizy.com/grade_6_math_worksheets_ontario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7af9881-1a69-4fb9-bcc8-4d0caa785a72/how_to_remember_volume_and_surface_area_formulas.pdfIn PDF document text
    • http://nopuxawox.epizy.com/supuxakerujasetexine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6384a7ef-fb0b-4c39-9ac1-a4935baaf8d2/cisco_dpc3825_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6da47d31-15da-4d27-a17b-115dcd1a5119/86610898016.pdfIn PDF document text
    • http://baxuzotaxuli.epizy.com/effective_email_communication_skills.pdfIn PDF document text
    • http://xoxozuzupa.rf.gd/48644627244.pdfIn PDF document text
    • http://mogufumifeged.rf.gd/calisthenic_movement_level_1.pdfIn PDF document text
    • http://vawerudarasikow.myartsonline.com/wuzijona.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 5256 bytes
SHA-256: 2f33b05663a887c15a5d7883733eefbdda886b59f88436ca819a99dbfc3113e4
font_01_sfnt_off00011df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 11208 bytes
SHA-256: 276f183ec6a2bcac7339f15e9fdd68f61a6ea78842c23fae2ac2ee941b93761b

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