Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1253b661428e2d…

MALICIOUS

PDF

73.8 KB Created: 2021-03-23 06:53:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dd7318fa1b3833755623b7d4deb4c731 SHA-1: 718c1aad97786c001e94b76cd7f50c59f21c4cdb SHA-256: bf1253b661428e2d6aecb8457d6e6bae04a12562e9d85f2304d2867da358bed0
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-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.
  • 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://ponafet.ru/award?keyword=definition+of+motivation+in+management+pdf PDF link annotation
    • http://supsun-aero.com/dewalt_xtreme_12v_max_cordless_drillnjdk9.pdfIn PDF document text
    • http://zefabupinakodul.22web.org/warhammer_40k_dark_angels_codex_release_date.pdfIn PDF document text
    • http://spacexfoundation.net/harman_pellet_stove_cleaning_brushtlhyd.pdfIn PDF document text
    • http://powerpoint4you.ru/visifevibawazokupujoxcaai.pdfIn PDF document text
    • http://jasubizajimalep.iblogger.org/law_relating_to_charitable_trust_in_india.pdfIn PDF document text
    • http://beautysale.site/estrutura_da_administrao_pblicaeoefe.pdfIn PDF document text
    • http://vilopeg.xyz/3653628101l81yv.pdfIn PDF document text
    • http://vevatis.22web.org/what_does_it_mean_when_your_oil_light_is_blinking_on_and_off.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faxunarin.epizy.com/59952778450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb262f7e-89c3-40ea-91c4-416a757efa88/67137410317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf68a04-2a99-4266-8987-3cb731079acd/61783557867.pdfIn PDF document text
    • http://niworojuxine.rf.gd/6th_grade_ratio_worksheets.pdfIn PDF document text
    • http://gonuwufif.epizy.com/comune_campoformido_assistente_sociale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e72cef72-e0fb-4e0b-ab8c-75f0d51b8b28/sidaguzesarelusuxagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd79a43-a251-4e33-b20b-dbae4393cb99/nizifutuserejej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62231384-2de4-465d-9a1f-af78be7ee702/singer_4423_oiling_instructions.pdfIn PDF document text
    • http://wumekupewug.rf.gd/dr.seuss_books_read_aloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a54d372-0a1f-4686-9d31-a30e466b1ced/washington_state_senators_phone_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8e3d8d1-bae8-4514-b8ae-cb069fd35019/john_deere_l130_snow_plow.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_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 5112 bytes
SHA-256: 274fcf788d7fce05d6d60644fca376c2c0b0059b6f47d0d4b071b885aff12326
font_01_sfnt_off0000f5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 10404 bytes
SHA-256: b0ae166438eead909fed3d89096f45f3d76bc7808938d88e90d14172605355ab

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