Malicious PDF — malware analysis report

Static analysis result for SHA-256 66aa06c3b746fa72…

MALICIOUS

PDF

90.3 KB Created: 2021-05-08 20:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9c7bd86e23e9411d40c11f7a60bf97f8 SHA-1: dd67291c0f152ef21e8f3da451bfe28c37591463 SHA-256: 66aa06c3b746fa72f0cca7237c90960d294ee65d0571a13bbd03bf60eb85ba74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9989

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 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://nipisod.ru/strik?utm_term=the+beginning+of+everything+tv+show PDF link annotation
    • http://mesretly.xyz/interior_design_softwareyd9b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_6054c8550e9f3.pdfIn PDF document text
    • http://xaraxag.mypressonline.com/tarikh_al_kabir_imam_bukhari.pdfIn PDF document text
    • http://stavki-na-sport.site/gadomutoary5r.pdfIn PDF document text
    • http://zexejodubaxiku.mygamesonline.org/urdu_blogspot.pdfIn PDF document text
    • http://re-prime.ru/international_mailing_address_usa_format99ete.pdfIn PDF document text
    • https://xabejopoturidu.weebly.com/uploads/1/3/4/3/134352457/810400.pdfIn PDF document text
    • https://logizovaxe.weebly.com/uploads/1/3/4/5/134506690/2483989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_6012bb600fd56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491925/normal_60600d961e2c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fca26bdef600.pdfIn PDF document text
    • https://mogarujatokeduw.weebly.com/uploads/1/3/5/3/135324664/4b369ed3ebf00a0.pdfIn PDF document text
    • http://fastcreditcheck.info/how_to_make_money_as_a_programmer_onlinexnq3i.pdfIn PDF document text
    • http://soldatskaya6.ru/beautiful_city_sheet_musictmpj1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378382/normal_5ff32467eb338.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://uploads.strikinglycdn.com/files/d335967a-7025-4bdb-a563-d1a26254494c/how_to_connect_hp_officejet_pro_8610_to_wifi.pdfIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_ec73fea69faa4f21872c3b137525d0ed.pdf?index=trueIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_e813b2762a5444669ef0ea6907614a18.pdf?index=trueIn PDF document text
    • https://ecc4b077-82d2-4cf1-ad45-1e482560a890.filesusr.com/ugd/5d7ac5_62d4e6e5fbf143a4b20fd80b2740107f.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_8c9b15e6581f42a8880e3cdfd07dc621.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b529a69f-1ef7-4827-a140-4fb6989ff6ab/what_type_of_oil_does_a_2006_honda_civic_si_take.pdfIn PDF document text
    • https://bb0106b8-f3e0-414b-a873-a0e24df3f2ad.filesusr.com/ugd/b84a33_7527c14cba454d90bd2b81792c55b76b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c97912-8c65-41cb-ac92-d0008a8b9afc/zasukexerepur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4dc84d-e263-4aae-aa8a-f2fe97cce213/aprendizajes_clave_ingls_productos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E4 4916 bytes
SHA-256: 273b4917e8b89d483011e0b9f9d5a316e79ffd0f4de9fc56ae9ba5a5715ad0ef
font_01_sfnt_off000127ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AE 11416 bytes
SHA-256: 152a9bcb4135e45d671885518438eb920f737988bc250ccd1202c353d2a0eb11
font_02_sfnt_off00014e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E55 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176