Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c88628328a46f4…

MALICIOUS

PDF

86.0 KB Created: 2021-04-21 12:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b29e307e20170adabc5ac5be865c7602 SHA-1: f878e496e432aa88cc7980fc34d77a3b9250d78b SHA-256: d9c88628328a46f4e1208360c5846169eaa2ccd53e0a6b8f2c849a86e9582c87
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'kuzutuzo.ru', which is identified as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://kuzutuzo.ru/strik?utm_term=how+to+use+binomial+theorem+on+calculator PDF link annotation
    • https://cdn.sqhk.co/bafuberudod/jbaEhbT/72940059729.pdfIn PDF document text
    • http://jajojonixoxax.22web.org/97213517601.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/Z1iihyz/zimsec_o_level_history_past_exam_papers.pdfIn PDF document text
    • https://cdn.sqhk.co/lotidonita/GmnWNij/star_wars_characters_names_a-_z.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/hhKLcx2/doodle_devil_ps4_walkthrough.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/penatalaksanaan_bronkiektasis.pdfIn PDF document text
    • http://bejagofeteveba.22web.org/attestation_sur_l_honneur_de_non_ressource.pdfIn PDF document text
    • http://joteruzawareba.iblogger.org/guide_rock_ne_diversion_dam_drowning.pdfIn PDF document text
    • https://cdn.sqhk.co/lixozimiz/idaigxk/car_parking_mod_apk_free.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/67ef1e73-4c07-4956-ae75-61b76f30a49b/suzalenavapimebebuli.pdfIn PDF document text
    • http://vifewupanog.epizy.com/30628416025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef93299b-db05-4756-bba3-205475ae2228/dometic_awning_spare_parts_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/pannalal_bhattacharya_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/fatatibelasikajokoluxaz.pdfIn PDF document text
    • http://kodelusewa.epizy.com/beginner_jazz_guitar_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/faa_ads_b_performance_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/114c7591-c32e-48d3-8491-1bb862530d52/15442763119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8e0ec40-2f5e-482d-9b9f-436afde54a8a/pikedaru.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/sibebowututulununinikofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2b43448-6cc0-44f2-b3ec-d5304c13e9be/what_are_the_greek_and_roman_gods_names.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/58453604704.pdfIn PDF document text
    • http://kulitetokap.epizy.com/zosulimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35782357-39b7-4edf-a250-08689c1028c1/dixafufaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81eb6da6-96c7-412d-96fe-5b905141ddfa/bovadogofad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95202ede-f27f-4397-8e66-ad5a743d71b7/54876934761.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 5232 bytes
SHA-256: e5ba5222ced65bb25cc08a88924656e1c3c3ddf484649240903df022a39c1002
font_01_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 4696 bytes
SHA-256: c90facfdc14b60f11021bcd33d84ac21ad1a06bc09f23deb44e2967a68a08527
font_02_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 11672 bytes
SHA-256: ba008b72935941ff85d72e24f4dbd71a80329e9ae9bbf7dcd56c4503bcef2674
font_03_sfnt_off000131fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FA 16336 bytes
SHA-256: 5056a5de17590a9b855d0bacc29d2d91430905b8c4697579dd1e8daf059c4ccb

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