Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66d5c8a29d27cbf…

MALICIOUS

PDF

80.3 KB Created: 2021-05-22 12:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0f6907b9ca0d40486b5c673ee2791487 SHA-1: 3d18b96cd2f2698ff864de5e33d37039fac7f7e2 SHA-256: a66d5c8a29d27cbf5115427be53dff474429f1626b7b4c0f4579bf009215dd4b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to domains associated with link farms or potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to a compromised or malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/strik?utm_term=preguntas+y+respuestas+biblicas+para+jovenes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372085/normal_6060182c0f2e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402718/normal_5fe0d2aada76d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488592/normal_5fe30c900cf3c.pdfIn PDF document text
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/89b9681e3f503d1.pdfIn PDF document text
    • https://pedagojewixa.weebly.com/uploads/1/3/1/3/131398360/kewunudenemebeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456985/normal_604e4ca628a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377902/normal_605c5c4d99da8.pdfIn PDF document text
    • https://vavivaso.weebly.com/uploads/1/3/0/8/130873957/61b753dfd.pdfIn PDF document text
    • https://xadafujivesa.weebly.com/uploads/1/3/1/3/131397927/womam_zokowotebobi_zidaxerolug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425921/normal_5feb21df42c71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467038/normal_60654720c5f03.pdfIn PDF document text
    • https://watogovujun.weebly.com/uploads/1/3/4/6/134626060/sugipum-jagivogot-wajugoter.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/sesijesule/how_do_you_get_a_medical_coding_job_with_no_experience.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/59436048233.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/adblock_for_uc_browser_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/viwesizafa.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/flute_sheet_music_classical.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/wujedidu.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/79651641972.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/blank_cereal_box_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/dota_auto_chess_pieces_guide.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_off0000f93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 5480 bytes
SHA-256: da82ae9d7b9c021f77bb6abf5165a0e6d5dbf73c320c25d5d1f3b802d52ad848
font_01_sfnt_off00010bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 11848 bytes
SHA-256: d8ad4034d8eb8dfd08405f618f975dc41cbd1154b59576f3f651312c311403d8

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