Malicious PDF — malware analysis report

Static analysis result for SHA-256 267634b2761a0c0d…

MALICIOUS

PDF

86.5 KB Created: 2021-03-08 01:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 34869aadce828d5744762ba560205acb SHA-1: c0115fc0444e5a486b63b008c89c02f716ccd755 SHA-256: 267634b2761a0c0d294f94e580f0a6108a9f1af7614dadc1c5d236f0b375eb55
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 of which are on disposable hosting, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/strik?utm_term=red+dead+redemption+undead+nightmare+walkthrough+ps3 PDF link annotation
    • https://nawolokiwepona.weebly.com/uploads/1/3/2/8/132814855/wesimigukepimiluroku.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/backbeat_fit_6100_wireless_bluetooth_headphones_sport_sweatproof_and_water-resistant_camo.pdfIn PDF document text
    • http://vedojuburokag.22web.org/onn_wireless_mouse_not_working_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/gexopoku/jijelcw/top_ten_free_ringtone_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/wovupeni/7jctHGc/27568043125.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/wPigjb3/32634287973.pdfIn PDF document text
    • https://lasajiboz.weebly.com/uploads/1/3/1/3/131379041/gugedijufunizom.pdfIn PDF document text
    • http://hackins.site/79710662364rnie5.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/1a26d.pdfIn PDF document text
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/xawewasibolisoto.pdfIn PDF document text
    • http://bioforce-co.site/fundamental_of_entomology_books5npj0.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/djcLLge/best_barcode_scanner_api_android.pdfIn PDF document text
    • https://jilarikogezinuv.weebly.com/uploads/1/3/0/9/130969280/zudabesolo.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/jhhbVif/zombie_derby_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_e408bba51965447387fbd566d8b4b3b6.pdf?index=trueIn PDF document text
    • http://lalukegadugubu.epizy.com/4940380168.pdfIn PDF document text
    • http://wonimawepesola.epizy.com/97482224766.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/70136758929.pdfIn PDF document text
    • https://1c2b20db-dbe1-4299-b4c0-f67d595d3b6c.filesusr.com/ugd/e71423_8a3abb38eba048d9875e755da08a7342.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_91c2729156614770a3a58f419c1839ef.pdf?index=trueIn PDF document text
    • http://zuvemodu.rf.gd/3_column_brochure_template_word.pdfIn PDF document text
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_2fa3900bb777409ba7377eff05d9f4ac.pdf?index=trueIn 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_off000113dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DD 5700 bytes
SHA-256: a39fda24bcda648ba457dcb90e33fd03791ca9bc60510284e771a49db2475be7
font_01_sfnt_off0001273a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273A 10704 bytes
SHA-256: 60d01f9872d8c5e87bdfe09037aa192975c9bf1916f415bc8cf2fb164cee96af