Malicious PDF — malware analysis report

Static analysis result for SHA-256 d155001585d59710…

MALICIOUS

PDF

74.4 KB Created: 2021-04-01 19:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2db6c1cc14cf1e454f802aaba2606fa2 SHA-1: c513fa41272c70ee7c9932ea3e8c6c1e909171ad SHA-256: d155001585d59710a90406e2038c2cbdbd8e3679907cdff2001ae6f74b94436f
146 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. It uses a callback-phone (TOAD) 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 0.9996

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/123?utm_term=california+dmv+bill+of+sale+form+pdf PDF link annotation
    • http://wosurijegu.22web.org/41628592386.pdfIn PDF document text
    • http://pobuzajabazuwu.iblogger.org/how_to_be_tourist_guide_in_malaysia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389107/normal_5fcb34e21c82b.pdfIn PDF document text
    • http://gegapaxibu.22web.org/guidestone_customer_service_phone_number.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379960/normal_600760ed18780.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lebaxa/kalender_pendidikan_tahun_ajaran_2016_dan_2017_aceh.pdfIn PDF document text
    • http://jutuvilulador.epizy.com/6332625801.pdfIn PDF document text
    • http://liwosajew.rf.gd/pepinatozod.pdfIn PDF document text
    • http://sisuvoxodukon.epizy.com/9512873344.pdfIn PDF document text
    • http://wirileso.epizy.com/rimedanoduripimotasobor.pdfIn PDF document text
    • http://rivamuboxu.epizy.com/brown_bear_brown_bear_book.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/votovivaget.pdfIn PDF document text
    • http://ginozegi.epizy.com/complaint_letter_to_hr_template.pdfIn PDF document text
    • http://varunogozanog.rf.gd/40905024017.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/med_surg_brunner_and_suddarth.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/51186299731.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/bojonelitapususavujikepod.pdfIn PDF document text
    • http://jalasofumikom.rf.gd/effective_communication_techniques_in_nursing.pdfIn PDF document text
    • http://fakadigat.epizy.com/nevaribuzanemanu.pdfIn PDF document text
    • http://tekabexorita.rf.gd/infinix_note_5_price_in_india_2019.pdfIn PDF document text
    • http://jejofasur.rf.gd/pasorawakigevijiras.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_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 5292 bytes
SHA-256: dc3832230dc97c6a7a6d0b803e60236ba80c92e315867b91100b970a39dec103
font_01_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 11024 bytes
SHA-256: c8aa09d6b0c64f72fa29c90675c5b17ebbfd1b67c0258fb5f6a804fee332e107

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