Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab80cc3eef2d8ef9…

MALICIOUS

PDF

76.9 KB Created: 2021-03-29 03:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eee80cc5f41b6a2e9f0ac172beeaefb8 SHA-1: d541cf9b75516be4a46cb6f353491728ab83204f SHA-256: ab80cc3eef2d8ef912dfcb909699923ca39158d9b96c93468f663ee0daaecdac
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 0.9990

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://mezovuduw.ru/award?keyword=december+calendar+2020+printable+pdf PDF link annotation
    • http://ladekepevij.mygamesonline.org/74523675496.pdfIn PDF document text
    • http://povisowalikim.scienceontheweb.net/el_ultimo_virrey_del_peru.pdfIn PDF document text
    • http://felesatediz.medianewsonline.com/tizamogovadamum.pdfIn PDF document text
    • http://maritimog.medianewsonline.com/89756853315.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/how_to_reset_a_samsung_vrt_steam_washer.pdfIn PDF document text
    • http://gozimudowojuzun.mypressonline.com/experience_certificate_sample_format.pdfIn PDF document text
    • http://nebuxopav.mypressonline.com/tagubo.pdfIn PDF document text
    • http://timinome.getenjoyment.net/monotheism_and_polytheism.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/ae952fa7-029e-4af1-a2e4-12b4a304e443/nusok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f485468-c073-412e-88d3-0128d7f2b04b/midi_to_usb_adapter_diy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4061681a-d6a2-4175-b6e2-97d2bf59a379/feremodubifozisip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d5b50e3-d383-41f8-8175-4e4aa0e0ed1a/rotedif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a59e998-cf7c-4ff2-930c-6fc13e2ae63c/745945706.pdfIn PDF document text
    • http://bafuwujix.atwebpages.com/93203238561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/787438de-338d-43b5-a996-344d9b359d1b/70701345092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcbd5b97-f8c0-4d50-8a02-5e90c9d8d2ef/fumifuxuveromir.pdfIn PDF document text
    • http://tipokeviti.atwebpages.com/optional_protocol_of_cedaw.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_2c33de3a3623449c9ea1310b7dfecba3.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_eb4fd30a96574886b101b1349d83d18f.pdf?index=trueIn PDF document text
    • http://zubiluwetij.myartsonline.com/88098577182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc22526-dd23-4460-b3fc-234276df3dda/how_much_do_crown_replacement_cost.pdfIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/what_do_icons_mean_on_iphone_8.pdfIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_e013c3a932e545b18ae9022ee64aa94c.pdf?index=trueIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/99635347149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1710f1b9-ffb6-4a72-9d97-c9ea5672a142/24233966673.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_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 5536 bytes
SHA-256: 3b1718a6b55a16c7aacaaa83f8c28e820583079efca563ce79440a06bbd90609
font_01_sfnt_off00010032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10032 11016 bytes
SHA-256: b508e0bd8a822f3c47808fdfe3909e3ed633ad4cf397ed7e4bf8ab2428976860