Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb2d7eb919401ec…

MALICIOUS

PDF

143.8 KB Created: 2021-04-06 14:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: baf18cf48eb9c99e875462a1145ff3e1 SHA-1: c816fc8827950f69479f35d8a03be852d69baef2 SHA-256: 1cb2d7eb919401ec5c9f5cbe6a9b89a06207f0b128aa021bd9e4edaaf8923edf
126 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent external URI pointing to 'https://xajibur.ru/123?utm_term=outlook++windows+vista'. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL usage suggest it's designed to redirect users to malicious content. No scripts were extracted, limiting the analysis of its execution flow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/123?utm_term=outlook++windows+vista PDF link annotation
    • https://pimapavidi.weebly.com/uploads/1/3/2/7/132740410/16ab90c0e.pdfIn PDF document text
    • https://cdn.sqhk.co/radageroboko/jgDvhzR/ketujimaberido.pdfIn PDF document text
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/f6dba.pdfIn PDF document text
    • https://pobapuzelikawe.weebly.com/uploads/1/3/0/7/130739661/b27b349a7d.pdfIn PDF document text
    • https://cdn.sqhk.co/kukusagufo/jigSgiD/company_core_data_sheet_example.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/gLFajij/flying_dragon_battle_simulator_city_attacks.pdfIn PDF document text
    • https://moxalabukeziro.weebly.com/uploads/1/3/4/7/134772199/966ce172f8f789.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/jihh1Rr/baby_care_tips_for_new_moms_in_tamil.pdfIn PDF document text
    • https://galofufe.weebly.com/uploads/1/3/1/3/131384583/6704005.pdfIn PDF document text
    • https://vifixizunegivu.weebly.com/uploads/1/3/4/3/134349865/ccfd0509dac526.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/3ad90143-c72b-4505-8f6c-81f87ffc2424/17228606957.pdfIn PDF document text
    • http://kovemipenege.rf.gd/87543209569.pdfIn PDF document text
    • http://bozudob.epizy.com/length_chain_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f585ffaf-5c09-428b-bb3b-c64445c30ef1/how_to_remove_disc_drive_from_ps4_slim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a678f044-01be-498a-bd6b-815adc5dd168/does_walmart_sell_tracfone_minutes.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/58319365111.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/ei_form_for_short_term_disability.pdfIn PDF document text
    • http://dukojalili.rf.gd/quran_surah_mulk.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/sevibisugir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b41e64e-63e6-4817-80be-b5e317de226e/67995645153.pdfIn PDF document text
    • http://sudusolupuf.epizy.com/28125754354.pdfIn PDF document text
    • http://tirujukixiw.epizy.com/fated_alyson_noel.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
stream_002_off0000e791.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE791 92016 bytes
SHA-256: c53cc7bb04aff68e90c675f9e94ee7270767dcfd0590aadac1922e710626b210
font_01_sfnt_off0001fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBDC 4964 bytes
SHA-256: b44c193feed61047f3ee35f74ccd6febc2281bd235e6807f27372d8c5d6488b3
font_02_sfnt_off00020cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20CEF 10696 bytes
SHA-256: c00d34771b011e1265ae5874918aa895a106c84f86be16fe61ef0ba4fe9f9eaa

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