Malicious PDF — malware analysis report

Static analysis result for SHA-256 06bbed8303e478c0…

MALICIOUS

PDF

80.4 KB Created: 2021-03-24 13:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ea7f8d028261c28c783b43d6bfa30cfa SHA-1: cd799245c7eaaef31b3af099fc313f6e7a34f36a SHA-256: 06bbed8303e478c0e562fb039b59b4644af27c1cc1f56771917ca9492ed848d9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'mass external PDF link farm'. The document body, though heavily obfuscated, contains keywords related to 'Calidad de vida en el adulto mayor pdf 2020' and the authoring application 'wkhtmltopdf', suggesting a lure for SEO spam or phishing. The presence of ClamAV detection and ML classification further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://zajinet.ru/award?keyword=calidad+de+vida+en+el+adulto+mayor+pdf+2020 PDF link annotation
    • http://chempion.coffee/iift_placement_report9dmut.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/Hnhaja6/boribipuru.pdfIn PDF document text
    • http://thehensleys.org/davesamofibazafol7852j.pdfIn PDF document text
    • https://cdn.sqhk.co/fagevibe/5aic0pa/song_lollipop_lagelu_new_version.pdfIn PDF document text
    • http://okrasote.info/davukemovalinojepxcjh.pdfIn PDF document text
    • http://ompala.store/how_do_i_connect_my_bunker_hill_security_camera_to_my_phone357ja.pdfIn PDF document text
    • http://tugrull.com/27420441454hgvpu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nowokil/avoir_present_nous_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/abs_workout_ios.pdfIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_f35b9b5f9afc4cac80b833d0467f28b8.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_812147c45fc54e38a5b6b42f727a8d96.pdf?index=trueIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_06e289e305114998bd40114e554bcb84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cdc9400-9c67-497b-8f06-68c04d5c524c/john_deere_4045_engine_torque_specs.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_b78a519ca00c477d80ebc126e082a769.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/lisawexezurigadaz.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/how_to_program_dish_remote_to_samsung_soundbar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/758244a5-c4ed-450d-8f82-07258a1c787e/51416233091.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_32f2c32ea0a542dc9b6248425af47aac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76cc0298-878f-4f62-9c05-616203a1bcae/how_to_use_nespresso_vertuoline_plus.pdfIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_8037cc8540454fed9743c1c7c9c91efd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb0167c2-f299-4706-bbe7-dc791f6acc3e/what_kind_of_charging_cord_for_kindle.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_498cecd1029a412a96ab68ede2bf6eb5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxunu/philips_avent_electric_sterilizer_manual.pdfIn PDF document text
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_778340660f624171985c535b315f03e5.pdf?index=trueIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_26e19818c567473f8076a31cadf86712.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 5352 bytes
SHA-256: af07eddb3cebbc151e472860900e3b90b17fb866acdaf74da68f9a35d1c33bca
font_01_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 12456 bytes
SHA-256: c253c7c2f15698cc682d1991136e7b4802900f20084f1aa69ae759bdf7c59d88