Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d81c84b28ac6ca…

MALICIOUS

PDF

135.7 KB Created: 2021-04-25 18:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ed52ffd8ebbc47ed081583356f595883 SHA-1: 5a4699dc774d5083d3779d7f414856a6d5f6590e SHA-256: 37d81c84b28ac6ca4b01e1487ed800bdf418d5f2ba6f45358905ff71b7721ed8
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 0.9985

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://lozipotod.ru/strik?utm_term=mac+mini+user+guide+2018 PDF link annotation
    • https://cdn.sqhk.co/bupabumo/iai8zlX/spqr_a_history_of_ancient_rome_book_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445558/normal_600012d2e2a92.pdfIn PDF document text
    • http://heleogose.online/fear_of_colours_phobias_bandsj1hx.pdfIn PDF document text
    • http://circulyarkadigital.xyz/pathfinder_druid_feats_listxq0vp.pdfIn PDF document text
    • https://cdn.sqhk.co/kamepixuxuk/jfKlGjb/buzzer_application_download.pdfIn PDF document text
    • http://topplafond.xyz/how_to_use_black_and_decker_jump_startera7rtt.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/drinkwell_360_stainless_steel_pet_fountain_parts.pdfIn PDF document text
    • http://botefin.medianewsonline.com/analytical_methods_for_atomic_absorption_spectroscopy.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/wumafanulusamuxe.pdfIn PDF document text
    • https://cdn.sqhk.co/penunotati/ghQhcEj/google_calendar_widget_android.pdfIn PDF document text
    • http://speak4pro.com/stm32f103c8t6_arduino_bootloadervrrfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380228/normal_600001292d78e.pdfIn PDF document text
    • http://rubolanir.mypressonline.com/.pdfIn PDF document text
    • http://probkin34.xyz/36625438893x66fx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_600c56756fa16.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
    • http://jekurur.atwebpages.com/42043608369.pdfIn PDF document text
    • http://fazaburifug.myartsonline.com/traxxas_summit_parts_axle.pdfIn PDF document text
    • http://bipegokatif.onlinewebshop.net/5192128815.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/83991628963.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/javascript_format_number_with_commas_jquery.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/calculus_and_analytic_geometry_chapter_10.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/vagifiwab.pdfIn PDF document text
    • http://lavoxema.onlinewebshop.net/akai_mpc_5000_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/celestine_prophecy_experiential_guide.pdfIn PDF document text
    • http://zesugipove.onlinewebshop.net/oil_gas_company_analysis.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_off0001c5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5FA 5444 bytes
SHA-256: aad4bad6e460a7167f1f5def62ccf12f493e6abf00dbea081688739401e71a71
font_01_sfnt_off0001d85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D85A 12532 bytes
SHA-256: f163fbb32d615d9077aef1dfab484a7aabb4e2ff5d325d8e6bad61b2166b8a3c
font_02_sfnt_off000202fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x202FD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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