Malicious PDF — malware analysis report

Static analysis result for SHA-256 057bd09be1152af0…

MALICIOUS

PDF

91.8 KB Created: 2021-05-23 19:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 93fa8b122ca7be633fd2992339e61cd2 SHA-1: 1b246279bebc100a9a684e8cc466a638555a4ffe SHA-256: 057bd09be1152af0951da513688ba987f17ba1d37cbc54e4b9969fe3c20ca4af
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://midufefew.ru/strik?utm_term=how+to+pray+the+holy+rosary+step+by+step PDF link annotation
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/tusukuvi.pdfIn PDF document text
    • https://zizonilorixu.weebly.com/uploads/1/3/4/7/134772478/6247106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393508/normal_60228893aba17.pdfIn PDF document text
    • https://fitabidik.weebly.com/uploads/1/3/0/7/130776693/2664634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499984/normal_602a8c3d51da4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408587/normal_6032a1861ff77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_604ca16c3ca36.pdfIn PDF document text
    • https://sogitinavebifi.weebly.com/uploads/1/3/5/4/135400198/74857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426088/normal_6028f055ed841.pdfIn PDF document text
    • https://kadibunafi.weebly.com/uploads/1/3/0/9/130969561/1091167.pdfIn PDF document text
    • https://niniteju.weebly.com/uploads/1/3/0/8/130814631/8671888.pdfIn PDF document text
    • https://dosidebeg.weebly.com/uploads/1/3/5/3/135318632/9570848.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/93c0250a-29e6-4e8f-bd01-dd30ae5427fc/wesowirixuzigevokedega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0cf2ce-89e4-40e3-90d9-cc8d6648904b/23782921532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f353c874-2f10-418a-b3fd-2d2255d1e07f/the_autobiography_of_martin_luther_king_jr_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d943251-92ae-4bc6-bda5-a66d7d296d34/41265702860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5178faab-d8d9-4d03-bc41-fca2731eee7b/digital_marketing_courses_online_free_with_certificate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f28077-8579-43e3-af8f-cee52cf6a253/91950449583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43247dcd-dbb6-4235-92c5-d6c1d3df57ff/metodologa_de_la_investigacin_guillermina_mara_eugenia_baena_paz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba679639-7711-40b2-8a2b-02be7102708d/the_8th_habit_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3037bad6-08f5-4098-9b9c-68da250fc4a5/how_many_calories_are_in_an_arby_roast_beef_sandwich_with_cheese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/607bb0b8-5b96-4a48-b06b-e3354afa059d/24431846347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ab62594-0862-4e21-9165-44698fd4a2bc/hp_officejet_6700_printing_with_depleted_cartridges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c330e5a5-6f26-4866-9632-83b205cbc51b/complete_fighters_handbook_3.5.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_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 4836 bytes
SHA-256: 0061bbe0caea22c64b42964234fd1aa26c48598921fb0eeaa01296cac9e0f08b
font_01_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 10784 bytes
SHA-256: a5c7c50249cc9f587ad5be66347d7ecf7ab165fdb449b8f7e45331ec404fbc34
font_02_sfnt_off00013d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D62 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b
font_03_sfnt_off000152ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152EE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3