Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a97a4b175d8c7b…

MALICIOUS

PDF

76.7 KB Created: 2021-03-02 23:24:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b5dc951b4d6982443b1bbb8eea97e399 SHA-1: 2dc7b1ea6274238652aef54f9a5356d7c65348c8 SHA-256: 26a97a4b175d8c7b1add987b61899d44319869b20c38d98fcb39f26c151be83b
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 or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 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://jumiwimov.ru/strik?utm_term=modern+industrial+organisation+carlton+pdf PDF link annotation
    • https://magenudelekoj.weebly.com/uploads/1/3/5/9/135975171/d7677c.pdfIn PDF document text
    • http://train-home.ru/gimej9lozs.pdfIn PDF document text
    • http://kibizife.iblogger.org/72180577911.pdfIn PDF document text
    • https://mazazogadof.weebly.com/uploads/1/3/4/3/134374066/rozilevoxi.pdfIn PDF document text
    • https://lemuwepino.weebly.com/uploads/1/3/2/7/132712354/guvifipozotumo.pdfIn PDF document text
    • https://pimetukuke.weebly.com/uploads/1/3/4/0/134017259/4293091.pdfIn PDF document text
    • http://tameenegypt.com/wapodutuwetugujim2jnhu.pdfIn PDF document text
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/89f0f3d682105.pdfIn PDF document text
    • https://ruvavaru.weebly.com/uploads/1/3/0/8/130874457/6ff06f8abc9c0.pdfIn PDF document text
    • http://findattime.com/remstar_m_series_filtersjjdmz.pdfIn PDF document text
    • http://superheatbelt.xyz/369842288833gluz.pdfIn PDF document text
    • https://lewumime.weebly.com/uploads/1/3/5/2/135297270/jilek.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/73130549476.pdfIn PDF document text
    • https://gapuropiti.weebly.com/uploads/1/3/2/7/132740804/622be7190f90b38.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
    • http://dugukob.rf.gd/15867714238.pdfIn PDF document text
    • http://vetovolixexa.epizy.com/atul_purohit_na_garba.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/rebecca_daphne_du_maurier_book_review.pdfIn PDF document text
    • http://tugosujamas.rf.gd/blair_witch_game_2019.pdfIn PDF document text
    • http://xolevusafo.myartsonline.com/how_many_chickens_can_kill_an_elephant.pdfIn PDF document text
    • http://vebagakid.onlinewebshop.net/mophie_user_manual.pdfIn PDF document text
    • http://vomotoboxavixot.epizy.com/92139268109.pdfIn PDF document text
    • http://tukorokibenej.epizy.com/98153688320.pdfIn PDF document text
    • http://bonitadobizaw.epizy.com/9748970900.pdfIn PDF document text
    • http://zuvuzevo.atwebpages.com/what_are_the_responsibilities_of_a_teacher_in_a_preschool_classroom.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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 5212 bytes
SHA-256: fffe972e90dbf4bcba3f64a6ed44e013206b272c14ec2b1527e75d2fa34fa430
font_01_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 11020 bytes
SHA-256: 2e82318caccc8379e02b63b23e04606c8f3e53e7c19ea786858ff3c9181828d5
font_02_sfnt_off00011715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f