Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac4594fc8672fe4…

MALICIOUS

PDF

82.6 KB Created: 2021-04-21 10:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7bc67997ceb52fb6434dcb211b84f4eb SHA-1: 42fc48ea71927b61757a8a1a33175b82532fcd47 SHA-256: eac4594fc8672fe454263e016150836de34d12e2b15b70baf5e7595cbb2713b7
244 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to keyboard functions, potentially a lure. The primary malicious URL identified is https://yafferge.ru/strik.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+do+capital+letter+in+keyboard In PDF document text
    • http://elinekici.online/star_wars_the_old_republic_bad_guyo3uo3.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/invertebrate_zoology_barnes_download.pdfIn PDF document text
    • http://netewe5.xyz/74270500350zl2tu.pdfIn PDF document text
    • http://tanemazijafawin.medianewsonline.com/puguselezomuwobatun.pdfIn PDF document text
    • http://fakaripeti.xyz/dobegimopasuxamedb44r8.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/66864633364.pdfIn PDF document text
    • http://reduslim-italia.website/make_your_own_apple_music_playlistnbuln.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/33ff376c-0c7b-4992-9ef6-515e6e57042d/sidadovogaxibomitivinow.pdfIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_d1212eb86da44295bd90d8faa721de73.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c5643f9-fb58-47ae-891f-b9bd5849f53a/70825262571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/417ed05b-b487-43cb-9356-023d9526382c/basics_of_biblical_hebrew_vocabulary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b0a3e4-772e-4d7a-949e-3067bb3888dc/the_depths_golden_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/155f61c5-e16c-45a0-9f18-c5e7d4079355/95874678750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/084b705a-1090-4c94-b2e7-40eeacf7629b/what_is_service_of_process_email.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a5a245c-3b53-4e3e-9a44-7bc99e85bfae/heat_n_glo_fireplace_inserts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b63fa945-92d0-48ce-8b5a-1db02d73d6d3/jubuxegulunoduzoxuvuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4ef6f7-2083-4f60-8540-ee191d8a656b/wuzekunonodatafus.pdfIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_93076c2e02d24585900c10f8ce9bef0e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b80fc5-08a5-4ac4-addd-e677abe15b37/didas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe893b3-43f6-464f-ac16-f08f7a42e11d/when_peace_like_a_river_hymn_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f326e213-7bac-474a-ab8f-b7f70d18fa18/65088571294.pdfIn PDF document text
    • https://147762ec-90f0-4523-8579-43cb3cd17c82.filesusr.com/ugd/6c48b9_0bcf7bacbb0a4f108ffa21d91237e481.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2179ae0-934c-4620-8246-95df94592da9/what_does_economic_growth_mean.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_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 5036 bytes
SHA-256: e7c0371efff3c3c5a57e370214c43c1a31a79b8e939bfd5a8bef27997c0400a7
font_01_sfnt_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 12284 bytes
SHA-256: 3d543737cf9202c9e3e2102edeb755b4370aeca2e2c1e0f088edcd88ed09ac85
font_02_sfnt_off00012e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361