Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f8cff2be171b14…

MALICIOUS

PDF

77.2 KB Created: 2021-03-04 15:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b1505d774dcbd08648a6c34ff74479e0 SHA-1: 0569b8d270409d1d623aa9f548fcf7a530218965 SHA-256: 49f8cff2be171b1485513fd44886a7443c3663e2f2fd92bfcad331b188e20065
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 0.9956

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://crophysi.ru/strik?utm_term=drawing+of+spur+gears PDF link annotation
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/wigoredegef.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/5646522.pdfIn PDF document text
    • http://zotikarida.medianewsonline.com/v_for_vendetta_removed_from_netflix.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/undoing_yourself_with_energized_meditation.pdfIn PDF document text
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/mosafisafov.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/which_smart_thermostats_do_not_require_a_c_wire.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/74e4d9d5-8358-4b2c-9202-071d50e33e78/ms_projects_2019_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/is_roborock_mop_worth_it.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/363248484.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/63854482025.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/62810572504.pdfIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_141309356e7e4ff688c2748043f49cf4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79151d84-174d-4636-9b3c-af5d4373444d/how_to_update_astro_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/424aa1d2-2982-42dd-bef0-aabf582ff3c4/ps3_not_reading_discs_and_makes_eject_noise_fix.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_4f4a12363ae142b4a8f6711c411f200a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/mosixepilinobobufuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c930bf-8277-4890-b9fb-5c810c73b643/92368900069.pdfIn PDF document text
    • http://nizowozutagele.atwebpages.com/65433400235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f8c1c5-a3e3-41c4-ab02-e75ca297bfe3/juzivobevikaboj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3580fa4-98c4-4922-ba60-b3239874ab0c/tafheem_ul_quran_english_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32544e2f-29a1-4a49-b41f-042c3b8cb860/game_of_thrones_graphic_novel_review.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_5f8727fab0c04249b38fe570cc23507f.pdf?index=trueIn PDF document text
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_3565e816e23348ec8fa348a2a8965db0.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_7c0243e016084a27a92e7bb2aca97cb2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c464f7ee-57fd-4c5f-9da1-dc1c9a88cf9c/gedixekazes.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/demuzupuripapunojisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4263171-a6e7-4b50-befe-8787cb729b81/sabazupavanugovediz.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_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 5128 bytes
SHA-256: 2586b282bd35c5b00f235d6e5e1fcc555d8cb4f5dcdb949ced5828cf10835229
font_01_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 10600 bytes
SHA-256: d3db8b7a08db6d08f5a49ede7db0641a119006533d004e01668fc0662c944177