Malicious PDF — malware analysis report

Static analysis result for SHA-256 5195afb30e0f1966…

MALICIOUS

PDF

86.4 KB Created: 2021-05-29 14:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dd3f7b2df1ea6baca553ad1723a18e7a SHA-1: 729497bd75f31aee7f2dc76eb27901abbf10bcb4 SHA-256: 5195afb30e0f1966a681e8a0eedc860a3aaa9d2139df7b5b6dc389e03cf0062d
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 0.9991

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://soxebez.ru/123?utm_term=chupke+chupke+1975+movie++in+hd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5fdad5ef5a24c.pdfIn PDF document text
    • https://fupigipefixoxom.weebly.com/uploads/1/3/1/3/131379213/mekizipupebo-gamamafefoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379241/normal_5ff3f6bfde0fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451762/normal_60126a9f40c88.pdfIn PDF document text
    • https://fixugosotodig.weebly.com/uploads/1/3/7/5/137518485/nukafufarezanijix.pdfIn PDF document text
    • https://tepikibinaf.weebly.com/uploads/1/3/2/3/132303010/fazugaj.pdfIn PDF document text
    • https://zojovotonoturur.weebly.com/uploads/1/3/5/3/135348007/fbdaed78f0ea6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381085/normal_5fed73434934a.pdfIn PDF document text
    • https://zelewebekosol.weebly.com/uploads/1/3/4/6/134638009/36b20f7.pdfIn PDF document text
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/ritasenawoda.pdfIn PDF document text
    • https://mojibivod.weebly.com/uploads/1/3/4/4/134490358/vukole.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/71c5c593-0cca-47e1-8989-06e3fbe3b8c8/find_someone_like_you_snoh_aalegra_chords_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b516ae-1330-472e-8578-f0cc74703e18/what_to_do_if_your_keurig_is_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e2c896e-3096-4b21-8ed4-2b2e13616a50/how_to_keep_your_employees_engaged_during_covid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a842a93-56c4-467c-af91-14c670a75b45/states_of_matter_worksheet_8th_grade_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c6face-06da-41cd-93e9-d066605e8b8f/how_to_get_android_9_on_s7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31078811-8966-4a6a-a7eb-752c1b8c3e25/who_files_a_ucc-1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdfbd8a0-1e10-459e-bd08-ac49ee3c0973/ap_human_geography_textbook_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd6ee57-3b82-4d61-b571-062e3f634579/68376908870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8dc6ca8-a7ab-4dcc-b25f-d42d427f3d19/50_shades_of_gray_book_extract.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b60b256-98ae-4b1d-a757-3a20f65aaf9b/keduvuwepovavofozukuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bd8b95-68f9-4f11-9a29-099a655aa48c/how_to_build_a_hidden_gun_cabinet.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_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 5240 bytes
SHA-256: f275e4b3fcb0f499d1fae52d2b55ff4ac2e0c792b4705d52257ec3ba7fc268cf
font_01_sfnt_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 1896 bytes
SHA-256: 099d89093be102135c911a0e1d6cb497d4af1896e50bf9510546e5131dedf018
font_02_sfnt_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 11036 bytes
SHA-256: 56bb038f10f331c4dae8b0b3de4eb11b59e13fac6445583e65866a567890a38e
font_03_sfnt_off000133f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F7 16328 bytes
SHA-256: 15f0a31da698c7f316952243961ddf5c22a7cb2efd9a3af6bf548cc88337cc41