Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ab16e041a65bc1…

MALICIOUS

PDF

82.8 KB Created: 2021-03-10 09:02:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e5279ed9f2da0abbd71a91ccb1dd1eea SHA-1: a8d67ac8de752eb951c987386d813fe4571348a6 SHA-256: 21ab16e041a65bc1ff3cc1c57cd551a8bbc98e71d03d81623caf352b57d055a4
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though partially corrupted, suggests a lure related to donation searches, directing users to external URLs. The presence of numerous embedded URLs, many on disposable hosting, further supports a phishing or redirection scheme. The primary attack pattern involves tricking users into visiting malicious sites via deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=what+churches+near+me+accept+clothing+donations PDF link annotation
    • http://gajaxujifusokul.mygamesonline.org/7115782048.pdfIn PDF document text
    • http://pedrons.space/how_to_reset_asus_rt-ac68u_manuallyfgrqw.pdfIn PDF document text
    • http://specialsale.info/entry_level_cover_letter_template_freeucgv9.pdfIn PDF document text
    • https://wajonurogizi.weebly.com/uploads/1/3/0/7/130738566/fesegu-ruvavunad-kupuva-zajufaxe.pdfIn PDF document text
    • http://cosmeteca.com/how_to_reset_adt_key_fob6w5dt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485800/normal_5fef95f29c600.pdfIn PDF document text
    • http://mixed-rootwork.com/megaman_x_rom_downloadhlywz.pdfIn PDF document text
    • http://vifubavawet.mygamesonline.org/when_was_maya_angelou_poem_phenomenal_woman_written.pdfIn PDF document text
    • http://shtancircul.site/tcs_managerial_round_interview_questions_and_answerspjvlc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392871/normal_600012bb7e91c.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/xupedudinalinufolegotalug.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/torogowi.pdfIn PDF document text
    • https://kukonugaxa.weebly.com/uploads/1/3/5/3/135327287/kepotemok.pdfIn PDF document text
    • http://regsenatvumen.website/free_lds_sheet_music_piano_solott1iv.pdfIn PDF document text
    • http://catsism.com/80032759458xsdxk.pdfIn PDF document text
    • https://wibixebaroz.weebly.com/uploads/1/3/1/8/131856543/xipefanonasuxib-binabapamugaf-tuxonumod.pdfIn PDF document text
    • http://yogait.space/48724847541v5dg6.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://rosajeku.myartsonline.com/warhammer_40k_first_strike_review.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_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 5380 bytes
SHA-256: b76383dfd1cf4a8570cc71fb90b12f382717cad4e9aa7874db7f5b46f8334bb2
font_01_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 11024 bytes
SHA-256: a05f5c6c45cbb5deac6a21919b2a07d825b44573ca595f8727a031780b0a604b
font_02_sfnt_off00012f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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