Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b250c20086bc37…

MALICIOUS

PDF

136.2 KB Created: 2021-04-02 01:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6d50d6fdd2c0c0b6d30111ef7afd1042 SHA-1: 56770fe6abfb63a24a639726f6c77063f8ad39dc SHA-256: a1b250c20086bc37531ae0ff3806d4185e8c439b2cafe7328129bde40870d69b
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. It uses a seed-phrase/secret-recovery lure. 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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://resalured.ru/award?keyword=pre+algebra+brain+teasers+pdf PDF link annotation
    • http://timelessdecorum.com/eano_palliative_care_guidelinesedjtt.pdfIn PDF document text
    • http://bobr.space/33350732350ilczw.pdfIn PDF document text
    • http://skout.tech/961787256882ofna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456391/normal_601db6c1c6a57.pdfIn PDF document text
    • https://vefonero.weebly.com/uploads/1/3/1/0/131070196/11ff2bee.pdfIn PDF document text
    • http://cmb-accueil.com/nulomulodamozus209o1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484609/normal_5fe50d77adbba.pdfIn PDF document text
    • http://look-hotel.com/easy_drum_sheet_music_for_freepnae2.pdfIn PDF document text
    • http://front-glass.space/anonimo_veneziano_spartito_pianoforteyaimd.pdfIn PDF document text
    • http://rte-ita.fun/gopinixipugetomw4q6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_603860dd125d1.pdfIn PDF document text
    • https://viwukafum.weebly.com/uploads/1/3/0/7/130738591/vizakabugug_zujelefix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_602c3c1724b5c.pdfIn PDF document text
    • http://busforpay.online/739894236080gtp9.pdfIn PDF document text
    • https://ganipomadajo.weebly.com/uploads/1/3/2/6/132695424/xekuvamiki_libilesabijer.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/biziwi15hzn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_605b81b563628.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/mugevebopobiredef.pdfIn PDF document text
    • http://familyit.pro/77050160276cg1me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sudipefenivu.rf.gd/a_doll_house_act_1_quiz_answers.pdfIn PDF document text
    • http://zejuruk.rf.gd/88649895627.pdfIn PDF document text
    • http://nokudumufax.rf.gd/11880577844.pdfIn PDF document text
    • http://moraruvotu.epizy.com/bhramanam_serial_today_episode.pdfIn PDF document text
    • http://zowonotetejubi.rf.gd/rakifaruk.pdfIn PDF document text
    • http://maxitopatedawo.rf.gd/32180061746.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_off0001dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAD8 5348 bytes
SHA-256: 49ca49706a4b06e17b6bfb81d0358444cdcabd373089847102554330d5003d6e
font_01_sfnt_off0001ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED0B 11136 bytes
SHA-256: d458178e895126c555232e7e301b4df16c35d1f22b2bea6cdbf2f69f85a05380