Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac8631e7d6484bf…

MALICIOUS

PDF

79.4 KB Created: 2021-03-17 07:09:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4d8d1ba44711e87176534213c77160a4 SHA-1: 080474ac89e522c260be8cd3418928ef810f6488 SHA-256: 6ac8631e7d6484bfbe3a3844b243d07fa3e9bba82d31e8f116546141c57bf46f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to redirect users to potentially malicious websites. The presence of multiple external PDF links and the use of 'utm_term' parameters indicate a strategy to obscure the true destination and potentially engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/123?utm_term=anurans+in+the+philippines+pdf PDF link annotation
    • https://cdn.sqhk.co/loganidob/VjaeOoc/wastickerapps_memes_new_stickers_rage_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/hiLcDhe/house_party_tv_series.pdfIn PDF document text
    • http://prizinsta24.space/3827052146stwfg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475987/normal_605005ad62059.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/LzOyoge/zobab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_601af6c0060b3.pdfIn PDF document text
    • https://bovejivisesuja.weebly.com/uploads/1/3/1/3/131384116/87a4fd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_602d8c47eb57b.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/hMhjddF/highway_closures_due_to_fires_nsw.pdfIn PDF document text
    • http://shopeuro.pro/lorizapevezonurantbep.pdfIn PDF document text
    • https://cdn.sqhk.co/fopeziriga/igptha2/sherlock_tv_series_wallpapers.pdfIn PDF document text
    • https://remafubununabex.weebly.com/uploads/1/3/1/4/131437283/182428792.pdfIn PDF document text
    • http://trikotoria.ru/what_does_stet_mean_in_proofreadingbf6dp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_6014551ccb174.pdfIn PDF document text
    • http://temppicture.xyz/marrakech_medina_mapu13vj.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/guvezuserevurijgwd7.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/cbbc1457-bdf2-4470-8942-3ccb5a663c6a/wu_tang_clan_dance_with_the_mantis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4a60d8-690a-45a0-b66d-4bffddada026/inferno_dan_brown_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a464d0d-417a-4e3c-bd9a-f58c544ad182/diablo_2_dd_3.5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5da085d0-d25d-4b6b-ae94-2ac27fa1b65b/how_to_become_a_storyteller_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4364df7-f49a-4541-96ff-58e18afe0f51/how_do_you_thread_a_vintage_kenmore_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c758d3d-8d65-44e0-b42c-6a1c56f4efd2/cuisinart_ice_30bc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc2ce62d-a916-48b0-bc85-0c2c411a9d6e/algebra_1_textbook_mcdougal_littell.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 5120 bytes
SHA-256: 1dd2e489f6c27a35e2ef9e35211c8a30ac7b6cef9de75810cde957b95d4c9076
font_01_sfnt_off0001077b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 12840 bytes
SHA-256: 62f98bc9c24845734477c285e2ed19a7ea3a3bdddb5603ca35f84dd011066d8f