Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e28c96123b34bed…

MALICIOUS

PDF

84.7 KB Created: 2021-04-18 10:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 66e2216fa4b1cf059898556810cc62ee SHA-1: 7891a0ae793e8a5779bc462340de86d3e15138ad SHA-256: 1e28c96123b34bed30e2e113e723d669052f72f72f144161daccc6992458bb38
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 hosting services, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to verb conjugation, directing users to a suspicious URL. This suggests a phishing or credential harvesting attempt.

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://lozipotod.ru/strik?utm_term=verbos+en+ingles+conjugados+en+todos+los+tiempos PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473415/normal_5fcd7f0c06243.pdfIn PDF document text
    • https://zunodeni.weebly.com/uploads/1/3/1/0/131070331/22af160930e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420907/normal_60286cd13a1f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_600e53d079863.pdfIn PDF document text
    • https://sifobidegi.weebly.com/uploads/1/3/0/8/130874382/bononosipen.pdfIn PDF document text
    • http://meinekarten.best/fimeluxumt0916.pdfIn PDF document text
    • http://visionnew.xyz/how_high_should_a_bat_house_be_placedtf6qn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_6011fe6300dd8.pdfIn PDF document text
    • https://tagenomamoz.weebly.com/uploads/1/3/4/4/134476715/2582112.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423471/normal_5fcc03ca30a67.pdfIn PDF document text
    • http://choosenews.space/65859153042vb42w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486215/normal_605307cb1f4e7.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/can_i_study_medicine_in_english_in_spain.pdfIn PDF document text
    • https://duwiwobejul.weebly.com/uploads/1/3/2/7/132740292/2305776.pdfIn PDF document text
    • http://mkr-olimp.info/wufotaramivabejv8tde.pdfIn PDF document text
    • http://soldonlittleton.com/ladugixexobupobenogamq60f.pdfIn PDF document text
    • https://nidikibadut.weebly.com/uploads/1/3/1/4/131453007/6258279.pdfIn PDF document text
    • http://tututot.mygamesonline.org/97116176363.pdfIn PDF document text
    • http://solifixogalek.mypressonline.com/facebook_marketing_strategy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wegugoleta.onlinewebshop.net/vamas.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 5572 bytes
SHA-256: 8f2756c055dd9218b25c5220336e99cafd4be3bd09e8a0776d6dcedf2387d011
font_01_sfnt_off000109dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 10532 bytes
SHA-256: 4e815659125f3405bcc786cb1fc26f77c5b9e37a16aa7ecc78cdcb140f2c42dc
font_02_sfnt_off00012de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE9 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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