Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bbbd01b153298d…

MALICIOUS

PDF

71.6 KB Created: 2021-02-22 04:47:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 027ab2ed859e3c286254c5a2a3a3ae30 SHA-1: 96df013ee3dbe1c68c290ced8c616abcccc87a60 SHA-256: 20bbbd01b153298d5287bfc961dfb6ffd8f67d7c8b3d548b62c30024a0492335
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://druttle.ru/wb?keyword=best%20old%20black%20gospel%20songs PDF link annotation
    • http://onsideball.info/ielts_listening_answer_sheet_2020oeng7.pdfIn PDF document text
    • http://strongcreditscore.info/84031404317rryf7.pdfIn PDF document text
    • http://yazansoft.com/microelectronic_circuits_7th_edition_onlinekbgx5.pdfIn PDF document text
    • https://dasezakam.weebly.com/uploads/1/3/4/8/134883145/larowi_wedepijot.pdfIn PDF document text
    • http://endi-itali.space/kuzutaten8tpud.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/universal_rolling_millno42f.pdfIn PDF document text
    • http://torchqbfl.fun/vusegolupuvri6bt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/author_s_purpose_inform_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/carboxylic_acids_form_anhydrides.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/retunases.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/sadibesalokekelaxoraliku.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/acas_guide_flexible_working_requests.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/3mm_aluminium_sheet_nz.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_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 5396 bytes
SHA-256: 288093bb144c56ddda3d322312561a9a93d7919773e265ce5ae3cfd453500c16
font_01_sfnt_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 10568 bytes
SHA-256: a0e0203792f09af8f0db67f71b036bd337d7638cd8fa9c98d681ccde3d2f9951

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