Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efe79de1e892650…

MALICIOUS

PDF

83.4 KB Created: 2021-04-03 11:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5bb8dfbd78dcee7fb85c04c82b1403a9 SHA-1: c10f1324a86e726416d5e8222fc5526053d78273 SHA-256: 6efe79de1e892650ea650fdd7ef9ae97b3c044cef77215e866bc079fed498935
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded links and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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://nipisod.ru/strik?utm_term=medical+imaging+physics+book PDF link annotation
    • http://jarisudowapebi.sportsontheweb.net/jibipajodizutilorim.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/paradoxo_do_aniversrio.pdfIn PDF document text
    • http://meroxisawifagu.mygamesonline.org/abwab_us_sarf_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dubeminap/jhjaeK3/liripotifepakepuzijedanag.pdfIn PDF document text
    • https://cdn.sqhk.co/rekewuneboxu/LRW1mgd/89581995229.pdfIn PDF document text
    • https://cdn.sqhk.co/segisaxa/jdjeheD/boss_movie_songs_bestwap.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/hd0jhaf/tusifirifelep.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/21006114781.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/dell_latitude_e6410_driver_pack_windows_7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sepawi/94936007314.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/what_is_the_theme_of_the_death_of_ivan_ilych.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_d7c98b4137ed426eb8cbe61420b90754.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/cheat_coin_dls_2019_1_miliar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe56b86-6c1a-48c7-990f-0ff2727c7ee4/31599516921.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_7f514ea9a4f440529b22571619a3ec3b.pdf?index=trueIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_15b9473c0fb543a9979d028e62dd89cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/autocad_2007_tutorial_for_civil_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/tanumob.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/ielts_speaking_part_1_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ef3f611-c3fc-4a6c-a33e-e59b788089ab/10348494980.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/13835600736.pdfIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_b1f0a4184c8d4de8888cc3f6eece50c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d08d4e-0e05-42de-bdbf-f9e73bc348c4/steel_arctis_fire_and_blood_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5102005-cce2-4a29-a13f-e38700a919b9/how_to_replace_ink_cartridge_hp_deskjet_3636.pdfIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_875a36b3f109460b9189c3b28158ca1c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 2828 bytes
SHA-256: 2f32373152b86590eb5c993bf8dbb57d20fc33770b92bc1ec6b5fd985d660553
font_01_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 5704 bytes
SHA-256: 516e19c18f9a18d56e802814fb5e474cd95c51a4de9c28355ce3fe2b2c7140f0
font_02_sfnt_off00011a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A42 11012 bytes
SHA-256: 680f4b0dd0d5224d693173308828efbc82f0422b2b74e7de2a1bebd2eab9de44