Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f609fa3b1c488a…

MALICIOUS

PDF

119.2 KB Created: 2021-04-25 19:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c145a67863fee9d138268e3d4a96497c SHA-1: 251d8a9c8282a1093c30adbac42dfaca8527b493 SHA-256: b4f609fa3b1c488a8f319ba20d8000ca27e99d0e8f0c6eafa69d0c319f62264b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm, and one prominent URL points to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=how+to+get+uconnect+navigation PDF link annotation
    • http://goduvide.22web.org/96397984113.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/71434f12-a2b4-4924-a283-55e5217a39fd/grounded_theory_research_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1671a4c0-ccec-4861-a94f-3e3f6e893c57/simple_past_vs_present_perfect_multiple_choice_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89e47b0-7a90-4948-9dbe-fcb25e4c70cc/2013_honda_civic_si_coupe_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88f0aea7-8932-4995-a975-061c95f4d8b4/4908624864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/903eb368-c05c-4cd2-9d4d-63b20c1b700a/diablo_3_ps4_local_and_online_co_op.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_acaca69db6e44e7b8c3d14dd38f92709.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jadere/disgaea_5_class_proficiency_guide.pdfIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_72f1f81ac45a44bcb688469d203d1cb0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fca269c3-6828-4209-86f3-29741385c0aa/how_to_reset_honda_maintenance_minder.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/xifadevixaduludefepokak.pdfIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_87dbe8c51ea54f6ea4b931d5f217d7ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ec0b1c-6e2e-4a21-b892-f5f150159ef6/29558338322.pdfIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_02c79a6933b5466b85d00df84e88105a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff39d691-9195-4dac-944d-5ef822b474cc/trx_military_fitness_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/au480_beckman_coulter_espaol.pdfIn PDF document text
    • https://f0ded7c6-1882-44c2-b580-3fd8daacf182.filesusr.com/ugd/1cd4ca_48756f6f98c745fca918db8ee50b61ee.pdf?index=trueIn PDF document text
    • http://lofufizopugopo.rf.gd/adobe_flash_cs3_free_download_full_version_with_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdac84a0-4135-433c-aaf0-ae7056683d8a/what_is_the_immigration_and_nationality_act_of_1952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d17046d8-7702-4153-9a27-9cfc5e7bfbab/tumavogugevanosagelopevo.pdfIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_9a773a98df3445789fedd5f046b6e675.pdf?index=trueIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_62eaa7b8cf764083a19badd6901444eb.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_c1455caa1d274ef6b6e40315c2de5fdb.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_off00019651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19651 4772 bytes
SHA-256: 42dec38c21ccf7499ca700e0ea4bc2a548c469da24926d9569e1e3db231aea0d
font_01_sfnt_off0001a6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6C8 11460 bytes
SHA-256: 094c3046f341f618c87ff9571fe94e2243564d0a10b7f770da7bc14714b0a058

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