Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01482df0d6d3fb3…

MALICIOUS

PDF

80.3 KB Created: 2021-03-24 15:27:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2a0aa0706fe336af02d4e1884aded4a SHA-1: 454817aee0d69bc49ac03df0dd2f801b8e2daee5 SHA-256: f01482df0d6d3fb3a604e3c68d9863ff44be5be6ffac600a6eb28510a5baca12
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO spam tactic designed to drive traffic to malicious sites. The primary malicious URL identified is https://botokaw.ru/strik. The document body is heavily obfuscated and unreadable, but the presence of numerous external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=how+to+use+ryobi+wet+and+dry+vacuum+cleaner
    • https://cdn.sqhk.co/munuluxel/PcujaxA/74889158827.pdf
    • https://liwotagavujid.weebly.com/uploads/1/3/5/9/135961529/5795969.pdf
    • https://cdn.sqhk.co/rekubapapup/EShePgd/3d_speed_racing_in_car_mod_apk.pdf
    • https://cdn.sqhk.co/dujepiwewi/d8uZiaY/24380312978.pdf
    • https://cdn.sqhk.co/xemugugafot/jjjfzGs/jail_break_cops_vs_robbers_apk_indir.pdf
    • https://xegezegev.weebly.com/uploads/1/3/2/6/132683484/333041f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0058376a-6816-4413-9578-53648c800c45/jolly_phonics_workbook.pdf
    • https://uploads.strikinglycdn.com/files/bcab9d31-03c9-4601-8bc8-3473e63dda41/by_the_shores_of_silver_lake_chapter_summary.pdf
    • https://uploads.strikinglycdn.com/files/b394b03b-ea91-4c97-ae1e-9c555e7ac499/how_to_make_garlic_butter_for_pizza_crust.pdf
    • https://uploads.strikinglycdn.com/files/5c8d58e5-9ccf-41e3-b99b-f15e8ab040b1/bijumupimufon.pdf
    • https://uploads.strikinglycdn.com/files/e0060f39-01d7-4739-8ff7-dbfe6b4c8ed0/dedadulegulegatex.pdf
    • https://s3.amazonaws.com/nemafu/monthly_calendar_template_word_free.pdf
    • https://uploads.strikinglycdn.com/files/78b01edd-e29a-4501-96b4-f817f83b371c/singapore_math_dimensions_3a.pdf
    • https://s3.amazonaws.com/nemafu/sagubezanob.pdf
    • https://uploads.strikinglycdn.com/files/9855a32c-193a-4fa0-96a0-20dc9f2a187e/body_for_life_training_plan.pdf
    • https://uploads.strikinglycdn.com/files/942f566d-4396-43d1-ac8b-5db2863f236f/baofeng_uv_5r_programming_name_channel.pdf
    • https://uploads.strikinglycdn.com/files/5dd79300-9017-461c-8a8b-efb84dbdd3b9/jeet_kune_do_classes_online.pdf
    • https://uploads.strikinglycdn.com/files/df596340-00b0-4554-88b7-34159dad66ef/what_will_happen_if_i_only_eat_every_other_day.pdf
    • https://uploads.strikinglycdn.com/files/c3c8c2fb-ce50-4c08-8183-9c537ff2731a/27765238988.pdf
    • https://s3.amazonaws.com/tonisefoteka/how_to_change_a_harbor_breeze_fan_light_bulb.pdf
    • https://uploads.strikinglycdn.com/files/fd6a714b-49ac-418e-9dd8-610dfe3b7b54/bevezilit.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd2f.bin
2dabc4cd2dcf4191e1f2f8c9fe602a497ae513ca34c8fd97e2bf67dc4af066db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 5440 bytes
font_01_sfnt_off00010fb1.bin
9eef0d2f4796e8e78432dff6bf4b6596db46e3796dd22d1c2c2f3ffbda203e4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB1 10612 bytes

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