Malicious PDF — malware analysis report

Static analysis result for SHA-256 081be2950b2e3a7e…

MALICIOUS

PDF

79.9 KB Created: 2021-06-01 03:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: b0820643551a57de9725fad6e74abb07 SHA-1: 42491d63a1b8d1289ce6022acd65d03e7373c6ea SHA-256: 081be2950b2e3a7e24f90d0d4a5b5988632225797a16f85b3dba157fd6cf8dc4
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL containing UTM parameters suggesting a phishing or tracking campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is used to host multiple links on disposable domains. No scripts were extracted from this sample, but the presence of numerous external links points towards a phishing or credential harvesting attempt.

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 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://synerhu.ru/pbw?utm_term=cry+baby+wah+gcb+95+manual PDF link annotation
    • https://gelasinez.weebly.com/uploads/1/3/4/7/134763890/dasebinagexusa.pdfIn PDF document text
    • https://guwuribi.weebly.com/uploads/1/3/0/8/130873976/gofab_dodutabifodu_xogemaxanetoner_wefowi.pdfIn PDF document text
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/57a7e72448.pdfIn PDF document text
    • https://xuwejemeluk.weebly.com/uploads/1/3/4/3/134314543/3690456.pdfIn PDF document text
    • https://lupobola.weebly.com/uploads/1/3/3/9/133999804/nawelexe.pdfIn PDF document text
    • https://nuzidobekoxap.weebly.com/uploads/1/3/4/7/134750252/matadukegel-jakun-bividozelaji.pdfIn PDF document text
    • https://gubetixe.weebly.com/uploads/1/3/4/3/134314982/nevakiwikife_danenexobima_ribapuxe_xugifa.pdfIn PDF document text
    • https://xemalijojododud.weebly.com/uploads/1/3/0/9/130969235/navol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedetuwi.pbworks.com/f/mongodb_university_m001_final_exam_answers.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/sujizodakuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e3f9e4d-b778-47c5-8c9d-e8be9e34bc06/livesibazizetizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ca247e-8da7-4867-b2dc-f708b448333b/5_senses_booklet_for_preschoolers.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144428847/charlie_y_la_fabrica_de_chocolate_libro_alfaguara_juvenil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/543520b4-97b0-4f37-bb69-edfe837615a1/91098738984.pdfIn PDF document text
    • http://botinuba.pbworks.com/f/25788680574.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144428745/simoboxigudufiwadok.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/el_arte_de_amar_publio_ovidio_nasn.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/bunudiwep.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144434031/nefozawolowuworikuzulaxan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2041974b-44e7-426b-bffb-c30fef9c6ffd/how_to_help_with_round_ligament_pain_during_pregnancy.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_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 5552 bytes
SHA-256: 8b38e8df719fc55c9c368e19cb81987c5fc046b1de9c2f07b11c3783fd90a6ed
font_01_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 11624 bytes
SHA-256: 6ccaa1438c24a96de456fad5b5064b8eaf95944c27da1f4576251565ec45ef80

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