Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb9c21c23fe76fa…

MALICIOUS

PDF

63.2 KB Created: 2021-02-10 03:35:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bbe71c36c81217f204df7840ad0d9ebe SHA-1: d8e0e67ddbb825eb87cbb23bf45284f5d8c6f213 SHA-256: bcb9c21c23fe76fa80fbcd83879c123487afac1fccc532687b84ed726bf183e8
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or a trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/aws?utm_term=cooking+academy+free PDF link annotation
    • https://cdn.sqhk.co/fematixub/hhjNjbg/vovigibarejekuxebal.pdfIn PDF document text
    • http://lnstagramsecurity.net/vifidumelejad2s9i.pdfIn PDF document text
    • http://zarabatyivat.ru/306119941629stb0.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/jdr9CuF/sebizuxokabi.pdfIn PDF document text
    • http://forecast.bet/world_cup_all_time_statskq0kv.pdfIn PDF document text
    • http://c-advance.space/blockchain_python_tutorial6n8z9.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/rafesilovuwobuhu543.pdfIn PDF document text
    • http://probmake12.xyz/manorama_calendar_2010j5evy.pdfIn PDF document text
    • http://stylecurtains.com/deja_vu_mp3_initial_dj9xc1.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/ih0Mqii/jhaptal_taal_bol.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/synology_nas_admin_guidem42hg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gisonebabi.epizy.com/elf_blotting_sheets_review.pdfIn PDF document text
    • http://doruxexim.epizy.com/7008955385.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/aptoide_apk_2019_android_tv.pdfIn PDF document text
    • http://pixuxurarosu.epizy.com/plant_cell_coloring_key_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/29256354670.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_off0000bf31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF31 5204 bytes
SHA-256: 4334031bf9fe8d8b635b9a9a43410ea180b5feab4da8c1b5739d88eba88abccb
font_01_sfnt_off0000d0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E0 9196 bytes
SHA-256: 1699650218c16b5232fa2291abea5790df78dce262f660289bb3d61291550b3f

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