Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad91c78b4f279fc…

MALICIOUS

PDF

72.2 KB Created: 2021-03-22 01:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0bbd49dc0af41cb0e23d64378d40351b SHA-1: d3712c0361d2075e998ff07d986535f6604029f1 SHA-256: cad91c78b4f279fc09845e5a6b4d4805a3aeb64d481e957872a0f3f0d597463a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('xajibur.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, further supporting a malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=diary+of+a+wimpy+kid+amazon+prime PDF link annotation
    • http://dadibexibanewil.iblogger.org/what_is_the_best_3_bank_battery_charger.pdfIn PDF document text
    • https://cdn.sqhk.co/dakagugi/jggXiam/rimodinasolawubof.pdfIn PDF document text
    • https://cdn.sqhk.co/judigirowe/ajcIhgQ/download_ace_commando_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/ghAjeOt/xezeb.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/jdAtBhi/english_chat_rooms_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/gdicIjb/discovery_neon_glow_drawing_board.pdfIn PDF document text
    • https://cdn.sqhk.co/winexumalov/ha8Yjdz/2019_honda_accord_sport_manual_transmission.pdfIn PDF document text
    • http://vutisonoj.sportsontheweb.net/air_intake_system_design.pdfIn PDF document text
    • http://gojumoxalofeloj.iblogger.org/5635987645.pdfIn PDF document text
    • https://cdn.sqhk.co/wipabamof/gEgcaig/luduwofibobuz.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/vutunajipurobikaloti.pdfIn PDF document text
    • https://cdn.sqhk.co/jerizukop/d9ifNib/greeting_card_printing_software_free.pdfIn PDF document text
    • https://cdn.sqhk.co/lixabanitav/jabhe5s/13325679109.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujobope.atwebpages.com/43645147500.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/71764135593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d30898-81ca-489e-b189-b705f76da219/how_do_you_start_a_lexus_with_a_dead_key_fob.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/bionic_turtle_frm_part_1_practice_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21684309-e9f6-4521-a6e2-5b85a7f85ca9/20600385190.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/globalization_in_contemporary_world.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/aadhar_card_by_name_online.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/gozarusetakawa.pdfIn PDF document text
    • http://porevinivija.rf.gd/xifirosubanazekej.pdfIn PDF document text
    • http://tuzufuwav.rf.gd/subiputegudukob.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_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 5284 bytes
SHA-256: 04aad7873742bc4508be5277ab30190df9c1d32e5b4d9c570a4e4538d770dbdb
font_01_sfnt_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 10936 bytes
SHA-256: 36220219a5357b3e7b7bd562040be2b2e7b9609ece6d8cf9f241e255f6002cdf

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