Malicious PDF — malware analysis report

Static analysis result for SHA-256 173936deacea8124…

MALICIOUS

PDF

77.7 KB Created: 2021-03-04 19:28:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0c8e04d52142fec44cfed598e0edad26 SHA-1: 30b9a43c167773af372f614e3eeb518b3b8205d5 SHA-256: 173936deacea8124d907a1d475192ae9f38e7e812e340d6793f453bee4ac06e5
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One of the primary URLs, 'https://kuzutuzo.ru/award?keyword=humayun+ahmed+movie+amar+ache+jol', is presented in a context that suggests it's part of a link farm designed to attract users searching for specific content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7720

Heuristics 4

  • 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
  • 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/award?keyword=humayun+ahmed+movie+amar+ache+jol PDF link annotation
    • http://labincom-med.ru/defined_design_templatef3v9k.pdfIn PDF document text
    • http://batmbatm.ru/biwijizotepubq53i.pdfIn PDF document text
    • http://begetus11ppz.xyz/behavioral_neuroscience_8th_edition_download8s3vy.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/turip/resignation_letter_early_release_template.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_3d77c68f8b9d498a91341380c436d150.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zewimu/mosomofajidajuwawufu.pdfIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_9f3ea27a1d4e4bb593ce85de59d20b5d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4222cec8-5707-408e-917e-6ce1fd2b354a/tintin_bengali_comics_online_read.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/free_itunes_in_english_language.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/meters_to_centimeters_worksheet.pdfIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_3d86e2a41e6a4793943f260028e2069c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatisake/xowuzeme.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/pevubalaroz.pdfIn PDF document text
    • http://lojofoverom.epizy.com/rebivetorewulijisojiju.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/10857559009.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_92750fdcb86e4be2846d1f901859082f.pdf?index=trueIn PDF document text
    • http://vopevufiwi.epizy.com/babipasudeguvokasogifiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4177fbdc-c80b-410a-be88-4409ee246e29/25657191378.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/sharp_lcd_tv_gj221_remote_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/soccer_strength_training_programme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/496a4cfd-9cb2-4557-836d-4fbf7396ccee/what_is_the_literal_meaning_of_the_poem_my_papas_waltz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e403e9-f94c-4821-ad76-5ad7a741542b/nomopire.pdfIn PDF document text
    • http://boragilaz.rf.gd/diary_of_a_wimpy_kid_the_long_haul_full_movie_google_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec1b33b0-b128-449b-acfe-8a69d7b336f7/rodakilem.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 5200 bytes
SHA-256: 12c98be3c27615a2afdad4870dbbbacc4c8a1e1d2cca2cdeda60b5725f63beff

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