Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b39d27be680e0d…

MALICIOUS

PDF

89.1 KB Created: 2021-05-11 04:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 719097f540f82b0ef532bc711de57032 SHA-1: 9287521559edff9a000e6d69745577b99b693ab7 SHA-256: b7b39d27be680e0dd1cbc8d99b21eed30e80e581f1e8bdcca40f7a580159c6a1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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
  • 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://pelibifir.ru/strik?utm_term=do+creeper+farms+work+in+1.16.4 PDF link annotation
    • https://cdn.sqhk.co/rivinodati/fHgi7NV/giketa.pdfIn PDF document text
    • https://sajabewegapin.weebly.com/uploads/1/3/4/5/134592402/mosusipiwopam_wipuxanapixoja_robirabixatome.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/gcgcPij/10452850399.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/xalosurifanidu_damemusupe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372101/normal_5ff4188f405d9.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/jiegeij/65113732283.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/98909557273.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/2XauIhj/21290104223.pdfIn PDF document text
    • https://cdn.sqhk.co/jotoselu/b5i5hyT/34844975890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490523/normal_601b9b8768f55.pdfIn PDF document text
    • https://nutiduvurenomal.weebly.com/uploads/1/3/4/6/134681926/mewazimi.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://s3.amazonaws.com/putelekireza/mii_music_piano_notes_letters.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/damodarastakam_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/panasonic_customer_service_contact_number.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/comptia_security_deluxe_study_guide_sy0-_501.pdfIn PDF document text
    • http://nuladefamevib.epizy.com/pares_biomagneticos_de_parasitos.pdfIn PDF document text
    • http://gumusimigogasuz.onlinewebshop.net/disha_ecology_and_environment_compendium.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/how_to_repair_rheem_tankless_water_heater.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/rhyming_words_dictionary_free_download.pdfIn PDF document text
    • http://fevanazenanow.rf.gd/marriage_registration_certificate_up.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_off00010ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE5 5320 bytes
SHA-256: 4a52211305f66e122f044390bd3fbe97041a10672fe8a4c4f2afe4454368f7c1
font_01_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 11768 bytes
SHA-256: 5bf038fa70dbc9cca5e3b94147f0be731f6de90627e5ebbd4749fa471f689b5b
font_02_sfnt_off00014918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14918 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

Open this report in the interactive analyzer, or submit your own file for analysis.