Malicious PDF — malware analysis report

Static analysis result for SHA-256 2826261ebd3807cd…

MALICIOUS

PDF

100.3 KB Created: 2021-04-09 04:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: af72d0abdd5ff492a5f8dbdf9fcca380 SHA-1: ed7bbbd96acb85eff5a88019832f728916190149 SHA-256: 2826261ebd3807cddbe998538f76adc24748a70cb6cd8cb7c7f8c2ec98d0d1b4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains references to wkhtmltopdf and creation dates, consistent with a generated PDF. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://botokaw.ru/strik?utm_term=who+is+dilbert PDF link annotation
    • https://lewibodozibepa.weebly.com/uploads/1/3/3/9/133997785/7139896.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/heWQfjK/famous_90s_rock_stars.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375340/normal_6003b6d2cf9ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_6012989da507f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fe91372d8657.pdfIn PDF document text
    • https://cdn.sqhk.co/datagemop/hfOjinv/3310_classic_ringtone_ringtone_maker_mp3_cutter.pdfIn PDF document text
    • http://kleomaften.online/dwarf_beans_planting_guideunakp.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/bjfiage/dulujezofamedepuruvedivon.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/haj3ijR/granny_square_afghan_border.pdfIn PDF document text
    • http://carluxepaint.site/american_dream_by_edward_albee_sparknotesvqa8k.pdfIn PDF document text
    • http://bigujepu.22web.org/tutimi.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/4785e6d949f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_605e086b3e522.pdfIn PDF document text
    • http://gallery-shop.site/where_to_study_international_law_in_europekykym.pdfIn PDF document text
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/dobeguvak.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/iaijhKw/eso_crystal_blast_build.pdfIn PDF document text
    • https://xanosetad.weebly.com/uploads/1/3/1/1/131163691/4d494da8c6d7c.pdfIn PDF document text
    • http://freshka.fun/soil_mechanics_formula_sheety3pq8.pdfIn PDF document text
    • http://skidki-day.store/gorijituvigafaxumogasaxut7ar.pdfIn PDF document text
    • http://evgeniy-semenenko.ru/xevatoti3e8t5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406789/normal_603e512733b93.pdfIn PDF document text
    • http://praktika-ingenieur.com/bring_your_a_game_meaning2zunt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xomonorud.rf.gd/building_material_construction_download.pdfIn PDF document text
    • http://pevedelus.rf.gd/audio_books_48_laws_of_power.pdfIn PDF document text
    • http://fudinurozoxesa.rf.gd/93326801330.pdfIn PDF document text
    • http://valapapiwusujeg.rf.gd/disapabatixiwa.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_off00014ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE4 4856 bytes
SHA-256: 722673a8216aa04d5b21aa77646723cb1ac3c3a75952c44b1fbd6fda5576ef39
font_01_sfnt_off00015d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D6A 11344 bytes
SHA-256: 85d03aef99ce55f06c5331f5d5a55865746730f606c1a3b759580396fde1f86e

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