Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8127d91347cf70c…

MALICIOUS

PDF

94.8 KB Created: 2021-04-29 19:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4c2ef85177272a4e8efd33ece014e145 SHA-1: 56882fd4f283001633bf32a58e8c74547d79cc38 SHA-256: e8127d91347cf70c0599c751b509cd243ac0229986f0dc7d37ba335cb4e35f61
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 0.9955

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://golowaki.ru/strik?utm_term=what+is+the+best+book+of+knowledge PDF link annotation
    • https://cdn.sqhk.co/nananava/gdhfhgJ/solejeguxomitozob.pdfIn PDF document text
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/5129129.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/jhignii/93281845503.pdfIn PDF document text
    • https://cdn.sqhk.co/kawabewiwof/Wx0jthe/zodibipozenomuva.pdfIn PDF document text
    • https://sutogeva.weebly.com/uploads/1/3/0/7/130739298/jenubaburiwo.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/Xhjchjn/twisted_wonderland_leona_gallery.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoletef/UhifIxV/mudezurixuzujewezononuduk.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/nepexujob.pdfIn PDF document text
    • https://pekeweluxema.weebly.com/uploads/1/3/5/3/135304067/fukexowel.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://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_e2fe51f7bb0343f8be83f918f584fb8d.pdf?index=trueIn PDF document text
    • https://65fca3b3-7ce8-4d56-9bc8-ebe46cc5223b.filesusr.com/ugd/f6ed72_ce57acdfa036494fb65c3b5f0151dd4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e0590d4-f0f1-49ce-8f9b-b7246f3c3d76/45777589897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba93db2-9c92-48ab-82cc-55a2236654f3/46574104239.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_93ce42ac28084258842bc07d662be60e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc9fccf3-d462-46f6-be34-768ff9fabec3/toshiba_sd-v296ku_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9abe392b-52cd-41d6-9a08-54bbfb85d4b9/lenovo_y50_ram_specs.pdfIn PDF document text
    • https://d650f791-4ca6-4964-96f1-ba9fac0414c1.filesusr.com/ugd/adf9cb_4be227d327434735a471ecb09e9fc417.pdf?index=trueIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_12807cdd624f4f2ca315ff2bc47aa689.pdf?index=trueIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_9e74abd1b7a84772ac739e19c8ce73d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/395077de-165e-4091-ac33-e6f20fb442a2/12540819559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5410d6e0-921b-4b41-ba6e-5555cf5ee21d/4_pics_one_word_level_235_answer.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_be2e05b8adfb4eaa8f9e57523148db4b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d6e33d-c020-49c7-8dd6-a082cbb4a9ba/arduino_uno_datasheet_espaol.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_41e43d1e13024640b3a7e2dd0554be9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55625a19-736b-460f-87c7-391c17a8e2c2/jack_reacher_tv_series_season_2.pdfIn PDF document text
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_21c409269b3a42b2979bd585cd8b8d04.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A8 5172 bytes
SHA-256: b9c3c321b2513db1159c19c622d3d25b514fd74cc8f4f5cd2ab76f3f32f61d16
font_01_sfnt_off00013450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13450 12952 bytes
SHA-256: fbfc76fc22e3f0635084d840b7726d2b8694410d7511ad28b6ae9223b62f0b1e
font_02_sfnt_off00015f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F41 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3