Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1f9ead729dea8c…

MALICIOUS

PDF

72.0 KB Created: 2021-05-05 20:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f211235a21ef9cb0bfe4f2db2956c570 SHA-1: b8235fa50a8f1c5b6f00cb61b2bbcc8dcf7483ce SHA-256: 3f1f9ead729dea8c70ae16b4b83c13128d17ac2849945fbd8bbdbe306fc6cc6d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://zajinet.ru/strik?utm_term=kobalt+steel+adjustable+rolling+tile+saw+stand PDF link annotation
    • http://xafukuxovikovu.22web.org/psychology_books_about_love.pdfIn PDF document text
    • http://sarepoxorak.22web.org/worksheet_of_jolly_phonics.pdfIn PDF document text
    • http://niwawopomovaz.22web.org/free_printable_long_division_worksheets_with_remainders.pdfIn PDF document text
    • https://juwexulomo.weebly.com/uploads/1/3/4/3/134385858/jugojigozolosef_jogetovozerovog_vozorotadoli_desosuvudovi.pdfIn PDF document text
    • https://muwubuzegutan.weebly.com/uploads/1/3/4/6/134649477/xatogawabebepobidex.pdfIn PDF document text
    • https://fepexugoroba.weebly.com/uploads/1/3/4/4/134469665/1282378.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/gkifhgM/94971753369.pdfIn PDF document text
    • http://zedukibawubige.22web.org/piezoelectric_biosensors.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/dfnYdhe/5040903244.pdfIn PDF document text
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/sejamapasep.pdfIn PDF document text
    • https://xogevowizixid.weebly.com/uploads/1/3/0/9/130969953/be70cf16c2bb.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/kazozedujo.pdfIn PDF document text
    • https://pugulabojoxo.weebly.com/uploads/1/3/5/9/135993792/zotamav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c1adbbe-b65a-4c28-9da2-87cea21e0636.filesusr.com/ugd/496951_749b75eec48c4aa9a4f770e810c462c1.pdf?index=trueIn PDF document text
    • http://zalowakudedakov.rf.gd/amazing_grace_trumpet_sheet_music_easy.pdfIn PDF document text
    • http://garulolit.rf.gd/anu_pgcet_2019_answer_key.pdfIn PDF document text
    • http://tolelagegovoz.epizy.com/capsule_full_chapter.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_1940367492104a62a20a0d83d47e5466.pdf?index=trueIn PDF document text
    • http://gaxugozoj.epizy.com/student_academic_achievement_questionnaire.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_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 5268 bytes
SHA-256: 203da66c2022683cfa10256bb09907ead681816bec71955d8d498496345aa8f9
font_01_sfnt_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 11728 bytes
SHA-256: b7c5d6f9b5be0736e4a8ec5f63aa312f13827a43b05552f260304252decf4ada

Open this report in the interactive analyzer, or submit your own file for analysis.