Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c158ce77088096b…

MALICIOUS

PDF

67.1 KB Created: 2021-03-25 23:04:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bdd81fd4d1812d14356607b2c4e46785 SHA-1: ed80b65f1ec634f7e874573db9af3019e0ab033c SHA-256: 5c158ce77088096b498e05018acd5cac510a3bf57ac84e17c916c70f338276cb
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, one of which is `https://golowaki.ru/123?utm_term=broken+hearted+girl+mp4`. This suggests the PDF is designed to lure users to potentially malicious sites, likely for phishing or malware delivery, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://golowaki.ru/123?utm_term=broken+hearted+girl+mp4 PDF link annotation
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/losuzaxuwojurabi.pdfIn PDF document text
    • https://cdn.sqhk.co/jumuxabag/gxurMhj/livuvipemigubata.pdfIn PDF document text
    • https://degexaxi.weebly.com/uploads/1/3/1/4/131406510/911703.pdfIn PDF document text
    • https://gafepodaxo.weebly.com/uploads/1/3/4/6/134606739/7007281.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugewameru/ggOjzh6/4103440750.pdfIn PDF document text
    • https://lexabebuwapo.weebly.com/uploads/1/3/1/3/131383838/molegosa_tavikaded_lonuta_kumepewa.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/gchiORB/85264439530.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_7f6190f88c3640f3ad1462694a4c62d7.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_a184c5988ae3426b93f79fcc4c3c5afd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/376a90cb-23f5-46ae-8342-6708b67971a7/nizinimosugujimefig.pdfIn PDF document text
    • https://dfde94ff-8c6c-411d-9c04-f18b57906ec7.filesusr.com/ugd/47ec90_f07262c52160441881e14db0b3722f3e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/breath_of_fire_5_pc.pdfIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_1e73bf1f97ea45b389519cf8105baca9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bc629fd-ed28-4b93-b546-196d51d1353b/sat_and_sat_subject_tests_student_registration_booklet.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/how_to_make_a_bed_sheet_into_a_toga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/150540c0-9196-47b2-8fbf-687c41d24acf/dork_diaries_read_online_full_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/real_life_discipleship_training_manual.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_ee608807c3ac44b6b4692a31edf44abd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec60245-5fef-4732-8664-cf23b63b2a0d/dajenuwoxef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c03b2c-f8ef-469d-a2d3-71b20aca667a/tasizunafojila.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_b0ac72dfc4af4be3a6555142fa9ed184.pdf?index=trueIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_b488b9faf9e34019867c8df65f1710c8.pdf?index=trueIn PDF document text
    • https://dd91dc4b-d2fe-4aab-ab17-22023aa64d5b.filesusr.com/ugd/f05b1d_2ad0ae24d14c410d8405c521e8d1a2bc.pdf?index=trueIn 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_off0000c91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91B 5396 bytes
SHA-256: 8a7701b509c4621455cccf9c325246ca64dffa4d2c5d1b6ddc459d8b9d2dc61a
font_01_sfnt_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 10228 bytes
SHA-256: 91ff1747c0fd708347e1c01a6bc3f2c00dc5025ddc717d6de467a9db80c2d930

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