Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e58150f79c92a0…

MALICIOUS

PDF

92.0 KB Created: 2021-05-28 12:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c4268cd892acf64a4cceb5d8736a6bc5 SHA-1: 60017ac810f488eabc47d44f6f8d39ac2dcf25ec SHA-256: 52e58150f79c92a036dff2a62aac2051c0b19c5e2fd1a5e456c5ecf6574d0be0
186 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. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO poisoning tactic. One prominent URL, https://nipisod.ru/strik?utm_term=how+to+install+aprilaire+500+whole+home+humidifier, is embedded within the document body, disguised as a service manual. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/strik?utm_term=how+to+install+aprilaire+500+whole+home+humidifier PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412768/normal_6038916db2faf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452199/normal_602e3eb7cd7bb.pdfIn PDF document text
    • https://denowulak.weebly.com/uploads/1/3/3/9/133997299/wisum.pdfIn PDF document text
    • https://xugugizebe.weebly.com/uploads/1/3/1/4/131482894/6045441.pdfIn PDF document text
    • https://vowizata.weebly.com/uploads/1/3/1/8/131856430/xijotirukofog.pdfIn PDF document text
    • https://tebudewuve.weebly.com/uploads/1/3/2/6/132683230/f32b6fdf1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_600c70443604d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_60380421f3ade.pdfIn PDF document text
    • https://jutovadisew.weebly.com/uploads/1/3/4/7/134720627/xikeberobunenuj_kadubonut_kakejipute_wonoxobot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374852/normal_5feb08ea88f45.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/e696d10e-301f-4153-8fbe-3b132ea6718c/williams_allegro_2_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e7925a-b042-4fc8-a12a-ac3f21d2661a/lidovefab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2fa7283-6751-4960-a996-894d9cad0a23/esperanza_renace_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3edbe108-22cd-4ac0-b4ce-bb3412ce1fcb/rofazilujelek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08b1c161-57ac-4602-937c-95711622327f/what_is_the_juvenile_justice_system_in_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bb57f3e-ecee-42bb-83a8-e48434b68b8d/pavajitudijirarovosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c88c7f-727e-4b62-9d85-62d09a4c1169/me_and_earl_and_the_dying_girl_film_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6faeb50f-ad1b-4ebf-bf08-0956454b31e7/45276362024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c988695-822e-4072-8eae-e120cd02f11b/78605208158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f6a147-0fcd-47e3-b3ae-c002c3d68085/gta_vice_city_cheat_codes_download_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9136aa0-51db-4995-98ce-64efad52e6ed/archero_hack_ios_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f68d5a-db5e-4f78-a5a5-b8c4c35858a8/zenixelipemib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46626e09-311c-4380-8f79-d041665994f4/nijomig.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11983 5480 bytes
SHA-256: 2af1608e8dc253cdd39346242d2fe83fb2e66595dfdbfe2165b7b51907effcb9
font_01_sfnt_off00012c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 11872 bytes
SHA-256: 07f4d44f87586a68e26d335187493f6b08f0b3f1fc8653a6476cd8e1798b3720
font_02_sfnt_off00015416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15416 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e