Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a6b7772fea89ea…

MALICIOUS

PDF

80.3 KB Created: 2021-04-03 10:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0b4c77956a1976206014d35c39baffe3 SHA-1: 22a466a9d59586544e34a619d21f85fd88c8ea95 SHA-256: c2a6b7772fea89ea7f389d937421907a0ab22d463f8330abcfb3cc9164c46dfd
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 0.9993

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://zajinet.ru/123?utm_term=honeywell+he150+humidifier+manual PDF link annotation
    • https://cdn.sqhk.co/zupodejadofe/ibzYZZR/sosatalulatorime.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/yji4y6X/lorewe.pdfIn PDF document text
    • http://new-volosi.ru/how_to_fill_self_evaluation_form_examplesd885g.pdfIn PDF document text
    • https://cdn.sqhk.co/rosivapixove/Khbtigm/kikulekugire.pdfIn PDF document text
    • http://taygerr.com/barn_burning_murakami_explained51ly9.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/ngdsifq/86951768455.pdfIn PDF document text
    • http://openplafond.xyz/monopoly_junior_frozen_instructionsrb1z6.pdfIn PDF document text
    • http://wbigs.space/how_to_bend_an_offset_in_emt4evfv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_ef21d3e0fd89477389cb0e787dc48a57.pdf?index=trueIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_7e7167c80be2416d82ff241d62d0713a.pdf?index=trueIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_0121cbb6d8a04b389c6657246bc58cba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/patilawasu/xemowavifizol.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/guzapinixitowupatujedaj.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_ef071ebbebec4a928d1a1c75c8bdef77.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/tuwaralan.pdfIn PDF document text
    • https://24b051fc-04af-4e2d-8b9e-4e75c06063ec.filesusr.com/ugd/1a488c_ca284ce25c4a48798d51c3ec22c95713.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajixe/ssr_170cc_side_by_side.pdfIn PDF document text
    • https://52b03d57-94e3-497b-b2ee-5a576b8f136c.filesusr.com/ugd/67ae49_8eb08680bc964a6abee4bcfc595a26e6.pdf?index=trueIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_a6e855c507c74b7bb3ffe84d38fdd5f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0ada6d-888b-4b2d-aff6-29d15a347151/gojugadajikopepomuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d273ee4e-a1fc-4bf9-a799-28ae4380b71d/sodastream_source_black_white_with_flavours_source.pdfIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_3113379976c14f14bd4dcb05d65e432b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/how_fast_is_subaru_forester_xt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17808fe6-3fac-4ce2-b91a-9123eca2e269/91336411299.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_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 5444 bytes
SHA-256: c31de65851797ca8192736f053529a9e1de047f859a12cce91bb04dcce61ec9f
font_01_sfnt_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 10832 bytes
SHA-256: b2b335421fece85b017cf28b5dafdeac2b08fc0aa121d61d2ebb5d7ed124c94f