Malicious PDF — malware analysis report

Static analysis result for SHA-256 0423dd6bf5d441e6…

MALICIOUS

PDF

79.0 KB Created: 2021-03-21 02:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0a3cf0beeb6ec5ac446cf0aa8c19ba26 SHA-1: 64fd38c225481cb0fa23e4c429d6f605e4368bdc SHA-256: 0423dd6bf5d441e680bbc43bd60c80160eb29bb4d82f8a0ca27666b68f65ce92
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, containing numerous external URIs, with a significant number pointing to disposable hosting. The primary external URI observed is 'https://xajibur.ru/wix?keyword=teach+like+your+hair%2527s+on+fire+six+levels', which is likely part of a phishing or SEO manipulation scheme. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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/wix?keyword=teach+like+your+hair%2527s+on+fire+six+levels PDF link annotation
    • https://cdn.sqhk.co/kinibemazoz/jje8hgb/beat._ly_music_video_maker_with_effects_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/GIEggjj/mexadunuverosugapumubonip.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/57274806188.pdfIn PDF document text
    • http://metiwizonud.getenjoyment.net/karma_short_story_download.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/supusatafav.pdfIn PDF document text
    • https://cdn.sqhk.co/butixasa/ig77JCQ/best_jockey_in_horse_racing.pdfIn PDF document text
    • https://cdn.sqhk.co/bukoxomule/gfCSOjN/44342368225.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/ADhechg/galarian_zigzagoon_evolution_line.pdfIn PDF document text
    • https://cdn.sqhk.co/gagobuniponi/tic4hjc/beat_the_boss_2_17_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/uG4Iggo/12_hour_mountain_bike_race_arizona.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/hIxeI1Q/goal_line_blitz_3.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/173a29f4-dcda-410b-a7ac-b88c5f83f135/sc_dmv_locations_open_on_saturday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71fa00da-6c50-4e45-9f08-35eb64b0f5d4/pusuge.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_d35343157dbe414481083ba6ba4ea993.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a99ce807-f2bf-4112-8eaa-92065a8ab05d/how_much_does_a_retail_manager_earn_in_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d021324c-0861-4883-94b8-a14c03d6fb82/3003330771.pdfIn PDF document text
    • https://13006a6e-9b3f-4191-9e3f-064114488741.filesusr.com/ugd/34464a_a31f3a2fbe174d429ca898997dffb574.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7a0de1-0921-4e2b-8818-5fe4fbbf28a2/faliwiriwenuzasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc40ce28-50a3-4bdc-bc7f-715759e6d5a6/tinojusoludejilagibik.pdfIn PDF document text
    • https://d668ac4b-7052-46b9-8d0c-7e282d24ced7.filesusr.com/ugd/00fc84_4fe5f6d29afe449c9807bd0265fd111e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6428c7ee-ca72-4211-902d-7b51483d5d5f/what_is_a_good_class_rank_percentile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb009b6-335e-45b8-befe-69ebc7daf499/18354366099.pdfIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_fdf4346ed96944ee8ffe9d06560ac9a0.pdf?index=trueIn PDF document text
    • http://vimixof.onlinewebshop.net/tikurakekivakagamazowegiv.pdfIn PDF document text
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_8e628a7fd5f54ec8a520a7d33181e1bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfeca430-a540-46f3-a82a-caae2c89a62d/what_shows_are_on_us_netflix_not_in_australia.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_off0000f6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F8 5248 bytes
SHA-256: 956e35ababc025416cf0ef4ca60f60b9ee98ec12a2e567cadf22be74b999abc0
font_01_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 10468 bytes
SHA-256: 16d182fd3d47925d5d041e026642a01bf1bca30110142f16969a320bc897782e

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