Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebcfd3907bb0240…

MALICIOUS

PDF

81.6 KB Created: 2021-03-21 00:48:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa2a2b0852f657ead0d4e221c64674ca SHA-1: d4a0e1c33a9e0ad04b25ff14692566654901a54f SHA-256: cebcfd3907bb0240326d0b3a3dce6c7609c55930718e048a96cc512b2cfee595
214 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded URLs, such as 'https://yafferge.ru/123?utm_term=akbar+birbal+story+in+english+pdf', are indicative of phishing or malware distribution attempts. The presence of numerous external links suggests an effort to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/123?utm_term=akbar+birbal+story+in+english+pdf
    • http://sexogovo.iblogger.org/tusuwujagoda.pdf
    • http://vnds-super.space/nukumigivuzanumamazozezu38q06.pdf
    • http://legendnat.space/25429441375e9woc.pdf
    • http://forkidsshop.online/ben_10_cartoon_network8wsc6.pdf
    • http://belkwigs.com/government_application_formso2pzt.pdf
    • http://epaytds.xyz/arihant_ethics_book_free_download8iyb1.pdf
    • http://trickyturkey.com/how_to_scan_to_my_computer_from_brother_printerlyxjd.pdf
    • http://fullhp.info/lentes_de_roy_purdy_chilepfhmu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_1b256ceca59a4f3cb1d99537861575a5.pdf?index=true
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_9d10650f7e6b404680b3314e667bc77f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d0fbaa65-9569-4912-9e40-c5fae921f7f4/vizio_sb2821-d6_manual.pdf
    • http://keputeka.epizy.com/captain_marvel_full_comic.pdf
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_6772eebaddcc450bbffdfc70f113b91d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ef497f97-dcd3-46aa-a562-f6952b884389/how_much_is_chick_fil_a_20_piece_nuggets.pdf
    • https://uploads.strikinglycdn.com/files/0ec3a112-fa12-485b-9245-dff11ff06b80/18859283599.pdf
    • https://uploads.strikinglycdn.com/files/08900c91-1117-4b6d-93c1-162cce06542d/35961622784.pdf
    • https://uploads.strikinglycdn.com/files/2346e0b9-9678-4d88-83d2-3cad0f22d900/are_nordic_track_ski_machines_good.pdf
    • http://sofojosib.rf.gd/bunty_aur_babli_nach_baliye_video.pdf
    • http://duvufewitopemaw.rf.gd/five_points_of_darwins_theory_of_natural_selection.pdf
    • https://uploads.strikinglycdn.com/files/c63ca1be-aa21-4443-8fdf-5774e2149506/feson.pdf
    • https://uploads.strikinglycdn.com/files/8ae6b108-1028-455f-9e67-ef19dda0653b/how_to_get_shark_steam_mop_pads_clean.pdf
    • https://uploads.strikinglycdn.com/files/5de3bbf9-9bd1-497f-967f-9d3c3417b3f7/rt_vs_rt_plus.pdf
    • https://uploads.strikinglycdn.com/files/7dff44d5-344c-42fd-ae7c-5240a6ac66f8/concepto_de_investigacion_de_mercados_cuantitativa.pdf
    • https://82c1a4a6-0aea-44ab-842b-07cb5bdde860.filesusr.com/ugd/aafee9_3ab2e8d3b1c14cdaae9ab20becc881d3.pdf?index=true
    • http://fekukifenakojuk.epizy.com/14559553641.pdf
    • https://6974b9b2-fc2a-4e9b-9495-84ff65489eb7.filesusr.com/ugd/395280_f8e584dfd59e439ab432847e04aa6e92.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100fe.bin
ef47a0ecb97f2072def5cd6fb2dcfc5a3391a62d5cfaad7cd7e7f6777ebaab38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 5600 bytes
font_01_sfnt_off00011413.bin
63dd531fc329566db8fcb0fbcc98a9b7527a4cbc55f3b08fd16cce818b6e9663		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 10872 bytes

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