Malicious PDF — malware analysis report

Static analysis result for SHA-256 409acf22af2e9dce…

MALICIOUS

PDF

78.8 KB Created: 2021-03-27 20:04:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d1cd0ef2c1175e84abdbfa919c46ed9c SHA-1: f4017de5e173c5aeab6eca92fc18c6435e71c602 SHA-256: 409acf22af2e9dcec3bc26986896bc799fcfc28149b8945c3501b6b12044d541
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate content, indicating a link farm or SEO poisoning attempt. One of the primary URLs, 'https://seumenha.ru/strik?utm_term=telephone+instrument+repair+shop+near+me', is directly embedded and likely serves as the malicious landing page. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

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 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.
  • 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://seumenha.ru/strik?utm_term=telephone+instrument+repair+shop+near+me PDF link annotation
    • http://nesebonuvobeju.getenjoyment.net/95173127041.pdfIn PDF document text
    • http://rivafigikiwax.medianewsonline.com/87228044915.pdfIn PDF document text
    • http://getporte.xyz/awdhesh_premi_song_bol_bamka555.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/4071571348.pdfIn PDF document text
    • http://picply.ru/tough_solar_g-shock_illuminator_watchr6y7t.pdfIn PDF document text
    • http://tesocoin.online/both_sides_now_chordsjeeiu.pdfIn PDF document text
    • http://mujododaziwato.scienceontheweb.net/41610380499.pdfIn PDF document text
    • https://rofajubufilotol.weebly.com/uploads/1/3/1/3/131384128/926658.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/stock_market_index_symbols_list.pdfIn PDF document text
    • https://kolenogu.weebly.com/uploads/1/3/1/8/131871799/babasumoguw.pdfIn PDF document text
    • http://madamzero.com/3ds_max_models_free_curtains24zer.pdfIn PDF document text
    • http://grantmedica.ru/68375628445c8c99.pdfIn PDF document text
    • http://scriptbook.xyz/11945088701qd0bl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xuzakob/40962379833.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/resumen_del_libro_tus_zonas_erroneas_capitulo_2.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/oracle_sql_datetime_difference.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/8462353441.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/latusisip.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/bolixivifenubuxubimapoj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 4892 bytes
SHA-256: 48333bc9f9847aa9004863d31f7bab2644fd500e93f1d160982fb4788b436d4c
font_01_sfnt_off0000facf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 10764 bytes
SHA-256: 477bdd159bab2a4b59dcbdb4a37ca1c7c5616ed616d5ffd007e8a398d71d0a4d
font_02_sfnt_off00011fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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