Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dd2ddd8d94fda2…

MALICIOUS

PDF

80.0 KB Created: 2021-04-01 07:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fd0f0578f450dd1414235514ba772a4d SHA-1: 2b27f4de38ace4683bf688b307e948da0cbb7754 SHA-256: b4dd2ddd8d94fda2c2f971ff2a0e0bbf2340198897f94fe93e75e4d42e85e9e9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=craftsman+gold+6.75+lawn+mower+190cc+parts PDF link annotation
    • http://fibipowokogo.sportsontheweb.net/bantu_education_act_1953_interview.pdfIn PDF document text
    • http://berkeciftci.net/whats_the_best_diet_for_building_musclebc4lu.pdfIn PDF document text
    • http://levelupguild.com/renal_abscess_treatmentz5gx6.pdfIn PDF document text
    • https://cdn.sqhk.co/mokabawimav/cqahchM/racing_fever_moto_game_hack_mod_apk.pdfIn PDF document text
    • http://wejnpowk.space/steam_link_anywherenakps.pdfIn PDF document text
    • http://fitokapss.xyz/how_to_critique_a_stage_play_evolve24nno.pdfIn PDF document text
    • https://batagokefo.weebly.com/uploads/1/3/1/0/131070859/nexiledevepiwenofaf.pdfIn PDF document text
    • https://sulezesolujoseg.weebly.com/uploads/1/3/1/4/131452841/f6151c45570.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/android_arsenal_viewer.pdfIn PDF document text
    • https://cdn.sqhk.co/lifudidu/ijazwje/duvasozilititalozudum.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/hPgggfT/tenijotofotuwuvaxizewilas.pdfIn PDF document text
    • https://loxujonukirurob.weebly.com/uploads/1/3/0/7/130776454/puxolajaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pujumek.myartsonline.com/nejebikunabaseseguj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb07b14c-2d1d-4efa-8e0d-408fa471a432/topixugupubijav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa9cd601-012a-403d-899f-edbaf24f5606/wefijewikiputimak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2744f40-d1f6-4d52-b538-7080c7435789/87671013111.pdfIn PDF document text
    • http://rabelinowizufe.myartsonline.com/attestation_d_hbergement_exemplaire_la_banque_postale.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_off0000c19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19A 17884 bytes
SHA-256: 9a9da19e91f420a0bc32abcf1c15894ff3e9419db79006b1d645dc907d18516a
font_01_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 6212 bytes
SHA-256: 4f4e81eeff0056d0bdfaabd88f7f7cc2346ad933fae5aaffa0029ee74461ee24
font_02_sfnt_off0001106b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106B 9548 bytes
SHA-256: 5443438f1d242f1668fd34f6163c595c9b9f22e57e6fe2a56c478b55aee1b627

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