Malicious PDF — malware analysis report

Static analysis result for SHA-256 33093b65c3f839b5…

MALICIOUS

PDF

72.9 KB Created: 2021-05-04 02:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b51b99444478609f08a478cc29511a36 SHA-1: b309bcd4d5563251a521adbe6a8614ce0fba39fa SHA-256: 33093b65c3f839b5e02da4752acfdc975c4c253d4e40861c8aec7d7ebcbc87f8
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://lozipotod.ru/strik?utm_term=what+does+iron+curtain+mean+in+social+studies PDF link annotation
    • http://boomua.site/invisible_inc_strategy_guide8qvx0.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/el_pequeC3B1o_nicolas_resumen_por_capitulos0m085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393029/normal_606cf7415a7d3.pdfIn PDF document text
    • http://fineagencyy.com/89758586830ujnnq.pdfIn PDF document text
    • https://talasawag.weebly.com/uploads/1/3/4/2/134265385/7788582.pdfIn PDF document text
    • http://miiliioner.xyz/youcam_makeup_camerafu7ra.pdfIn PDF document text
    • https://lukafove.weebly.com/uploads/1/3/4/6/134655473/d5048f3cc3ade.pdfIn PDF document text
    • https://vosuzupitozom.weebly.com/uploads/1/3/5/3/135313705/kinavigaxuzelosojebo.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/fhdhjaX/carrom_board_game_play_with_computer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458827/normal_601026f7ef4ad.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/PgjgijR/lethean_the_waters_of_death_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497359/normal_60510524084fd.pdfIn PDF document text
    • https://zufezoro.weebly.com/uploads/1/3/4/8/134885884/9954505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490251/normal_604f3894d461c.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/sazilus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445750/normal_5fce7887015df.pdfIn PDF document text
    • http://keksik24.ru/63738906740arn5l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_60143fe957913.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 5192 bytes
SHA-256: 92c98e478294717095bb9be3a728b91c07548807c38dfafb3351884e70e43dea
font_01_sfnt_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 11096 bytes
SHA-256: 9b50963570508def3d71e7f5b53bd4ff66fa05e3128cee6ff781294cbdcfaef5

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