Malicious PDF — malware analysis report

Static analysis result for SHA-256 1757f3877a2a8d44…

MALICIOUS

PDF

73.5 KB Created: 2021-03-23 13:06:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1ba9ef1806a4c6f942eecfc7fae70aed SHA-1: 45ee2ca9c6a93357b7becfb8c17fc337c738ffb0 SHA-256: 1757f3877a2a8d4440764033a23c9ec5b9df42e428f602281b0f3d0ff00f188c
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, indicating a likely attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to product names and technical terms, suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=focusrite+itrack+solo+or+2i2 PDF link annotation
    • https://cdn.sqhk.co/zafupusapun/7xXjcDQ/clicker_fred_cheat_console_codes.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/a_dolls_house_quotes_about_gender_roles.pdfIn PDF document text
    • https://cdn.sqhk.co/vusunuvaka/jhrjagi/timinulokumosemunezesa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465719/normal_60069be1716e7.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/PzgfihB/38716326712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448129/normal_604f77c31e489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_604d2f3814dd3.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/99494453991.pdfIn PDF document text
    • https://cdn.sqhk.co/nepusoliweda/tiaVmja/comparing_fractions_games_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/zibutodepu/jWijPWp/whatsapp_free_for_nokia_xl_1030.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mukexojot.rf.gd/how_to_explain_gratitude.pdfIn PDF document text
    • http://kopipalowawaj.epizy.com/razivanipisebalepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1e46f5-6dd9-4dd5-a3d4-851a50d68875/sisijerilakugiduriwami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92749590-9a2a-4e67-b796-5ff624203981/taurus_millennium_g2_high_capacity_magazine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33a5d59a-0d43-4db4-9911-17cac44998e3/oracle_sql_developer_free_download_without_login.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_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 4944 bytes
SHA-256: 423900555cf74eae4e6381b643f634366333576dc6f64f35f18fb1ad26203008
font_01_sfnt_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 11056 bytes
SHA-256: d19475040cbf9222e1c41106f5a7aa448f575b254fea8156c9bb3f39e7887464

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