Malicious PDF — malware analysis report

Static analysis result for SHA-256 356355025edbcf41…

MALICIOUS

PDF

77.1 KB Created: 2021-03-23 04:06:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 2ca921343cd74fcfb3268d59a121f97e SHA-1: a0e82ceeb4a9706829c1e4be2b4ce74c88d0470e SHA-256: 356355025edbcf41a5410c1e0a280554d088e4de18a8c51b304221c3269d3c8d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with a primary suspicious URL being https://maypoin.ru/award?keyword=gestalt+therapy+pdf. The presence of many external links, some on disposable hosting, suggests an attempt to manipulate search engine results or direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/award?keyword=gestalt+therapy+pdf PDF link annotation
    • http://checkmycredit.info/how_to_build_a_house_in_minecraft_tsmccao24.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/xipugozow.pdfIn PDF document text
    • http://wekeb.space/one_punch_man_season_2_dvd_release_datecs6ej.pdfIn PDF document text
    • https://jufufowepum.weebly.com/uploads/1/3/5/3/135348100/redexapotan.pdfIn PDF document text
    • http://eferevole.com/mamokeruvemotaniwumosassyf6v.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/3e4d1198-31ef-4ecd-b1de-2cb7b2f9827c/is_the_game_changers_accurate.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_e63da517228f4308b602a59eee859ed2.pdf?index=trueIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_8963a8c1d7694bc194e12a142748a56d.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_e9f3af4004794e34b879443545133b50.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_dd986a9f2a4b4391bbf82ace2869800e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/66035014-d1ff-4533-9354-21d33dbefe6c/adidas_apple_watch_band_44mm_designer.pdfIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_83825cc9913541b7888c505ada9b1b6f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d05020-75ac-4264-9cca-e7abc51903c6/how_do_i_get_my_first_alert_smoke_detector_to_stop_chirping.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_08cb5cd029bc413fb5086d0929bce17a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd502c94-6e82-476d-baa5-a9878c60ca13/latest_news_about_lockdown_in_india_extension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9bf16ab-e596-4cc3-a91e-a257be773024/33529582986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcd19bd3-ed57-4f34-8742-7177deba5bbd/cyber_security_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f258be2-d726-4bc5-8f42-ee39a0c02907/wobutigazutut.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_ea1d7235587347edbbcd544a4375279f.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_fce1c10ea7ca489bb7aaf58bf54f7e05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64cb0a61-7f7d-48cd-9072-77eaaaf3d124/what_foods_have_gluten_in_them.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_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 5260 bytes
SHA-256: 3356e60534f54926d9ec6fa3ad5ef5187e964602c1cd858994209e911f5e3ced
font_01_sfnt_off000102d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 10864 bytes
SHA-256: b641bd473217eecf42dcd6d054cd7df09db8199bfcbf61ee5a97fd42311505ac

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