Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c1cbbb8e34b22e…

MALICIOUS

PDF

79.5 KB Created: 2021-06-01 14:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24b1b84a0006249491ee7c13da713bbb SHA-1: 84ad68d8b73d981634a0ee088dfe549361a2c473 SHA-256: 59c1cbbb8e34b22ece04fa0f876053b457255cecbbb8deb68e761f184c5747fd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious content, such as the URL 'https://synerhu.ru/pbw?utm_term=azar+apk+mod+hack+2021'. The document body, though heavily obfuscated, suggests a lure related to 'apk mod hack', further supporting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://synerhu.ru/pbw?utm_term=azar+apk+mod+hack+2021
    • https://cdn-cms.f-static.net/uploads/4449014/normal_605f6c1b032e2.pdf
    • https://verulezame.weebly.com/uploads/1/3/0/8/130814285/zipexi-xuniv-ruwufojolaxap-wixufe.pdf
    • https://cdn-cms.f-static.net/uploads/4495264/normal_6021e8e645f00.pdf
    • https://cdn-cms.f-static.net/uploads/4415045/normal_605f2b2f0092b.pdf
    • https://cdn-cms.f-static.net/uploads/4483354/normal_6022b7f3d40e5.pdf
    • https://jujamepusa.weebly.com/uploads/1/3/2/8/132815903/2808424.pdf
    • https://cdn-cms.f-static.net/uploads/4424935/normal_60152e9f8890d.pdf
    • https://cdn-cms.f-static.net/uploads/4383452/normal_60590239e7faf.pdf
    • https://static.s123-cdn-static.com/uploads/4499341/normal_5fca361e396e6.pdf
    • https://cdn-cms.f-static.net/uploads/4480743/normal_602a6bc75b220.pdf
    • https://cdn-cms.f-static.net/uploads/4421624/normal_601b429d61e9a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1832020f-2977-4c24-82e7-1392255f4ca9/bridges_in_mathematics_grade_5_home_connections_answer_key_second_edition.pdf
    • https://uploads.strikinglycdn.com/files/8e194bf6-7037-4e17-8ca2-b98e9154edb6/dawes_rolls_census_cards.pdf
    • http://mefijunov.pbworks.com/f/8_snf_veri_analizi_test_zml_sorular.pdf
    • http://runaliguredu.pbworks.com/w/file/fetch/144455550/how_do_you_wipe_a_lenovo_tablet.pdf
    • http://pamotekegopa.pbworks.com/f/how_systematic_synthetic_phonics_is_used_to_teach_reading.pdf
    • http://rasovuxosew.pbworks.com/f/wivelejajojutasaxafe.pdf
    • https://uploads.strikinglycdn.com/files/46aff6be-134b-459a-86a9-c1c56590ba2a/62516686315.pdf
    • http://xalomuzavege.pbworks.com/w/file/fetch/144458424/audio_file_facebook_messenger.pdf
    • https://uploads.strikinglycdn.com/files/f38021bf-209f-4a98-bc5a-543f498d6927/54456581103.pdf
    • https://uploads.strikinglycdn.com/files/be805fe2-f985-48c6-a028-d8d2ff2c3f91/megelovetoxafotomegopu.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8da.bin
8bdf55e702958804b1373a148464edd183608ba89f2196975b6cee59c8c32e03
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 4968 bytes
font_01_sfnt_off0000f9b5.bin
9912f017b8ae1dae5dc20ed44ef89fb5e5396dd3d634692785eec5a81da4be56
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 11688 bytes
font_02_sfnt_off000120cf.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x120CF 4324 bytes