Malicious PDF — malware analysis report

Static analysis result for SHA-256 8289e146705a47c8…

MALICIOUS

PDF

79.3 KB Created: 2021-03-31 07:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f4f87159a4f8b4d313cfaad9f723e194 SHA-1: a6b86be2f5c02e888559f6c687110fb74ea6c4de SHA-256: 8289e146705a47c865ce744fbb8d7b9973166dc2c6176db7be527709ccb1b940
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure, presenting a technical question to entice users to click on the embedded URLs. The primary URL, https://lozipotod.ru/strik, is likely used to redirect users to a phishing or malware distribution site.

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=what+is+the+difference+between+a+ni-cd+battery+and+a+ni-mh+battery PDF link annotation
    • http://creditactive.info/nefunifuyia6l.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/jdVRoid/how_to_draw_a_wolf_easy_youtube.pdfIn PDF document text
    • https://nezivubu.weebly.com/uploads/1/3/1/3/131384481/fomepujulefevimuwef.pdfIn PDF document text
    • http://nigasheff.xyz/google_spreadsheet_script_get_last_rowgyb1s.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/KIjaqib/barbecue_restaurants_near_me_delivery.pdfIn PDF document text
    • http://how2clever.com/bacteria_transformation_methodso4jxj.pdfIn PDF document text
    • https://bivedaniliged.weebly.com/uploads/1/3/4/7/134732971/wijiwud-mubabewotos.pdfIn PDF document text
    • https://katubebadidi.weebly.com/uploads/1/3/4/4/134474785/jemurujixukulu.pdfIn PDF document text
    • http://rebelliona.online/dd_classes_3.5_list5qzix.pdfIn PDF document text
    • https://zoponexe.weebly.com/uploads/1/3/1/6/131606878/2da2836.pdfIn PDF document text
    • http://ifeelgood.club/starz_encore_black_east_schedule6w61p.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/fihjiiR/surplus_tanks_for_sale_canada.pdfIn PDF document text
    • https://jizidetaji.weebly.com/uploads/1/3/4/6/134626841/vopodi.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/gjji0gc/mini_4wd_legend_offline_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bukulavor/agihheK/26776633885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/074926d9-862d-48cd-b408-f82e8ca0fac2/sedexuwuziwumepususiruked.pdfIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_3383acec3ee74c57914412d6e9e6ab70.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f70a32-7d95-4f4d-ae4a-4fce683c411a/what_does_the_bible_say_about_revelation_knowledge.pdfIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_b431505ec5fa41bfa48044657e4520e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/3615967552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46463b16-0510-438b-9583-f066db5b951b/following_3_step_directions_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/panusoveguzevugob.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_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 5608 bytes
SHA-256: 02c98d228ee6381f0d71d41d130e1ff3add2d3c2c0990fa83561e20378b6593d
font_01_sfnt_off00010a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 10884 bytes
SHA-256: f43a569d36c20d83f9dacda378c661e45926b326fa815a0989e05eddeef0f5f2