Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b28a84cf9d813f8…

MALICIOUS

PDF

77.3 KB Created: 2021-03-29 00:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a51da94e8201db565b754c12a64cf5ee SHA-1: 9fe9448169450b0c498b7d230f62cb1e1e0e3d4f SHA-256: 6b28a84cf9d813f8fc6b4a5a1f034fa0dc3c9502bf7bc4e1faa9a26913383187
126 Risk Score

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 0.9997

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://jottigo.ru/award?keyword=appreciation+letter+for+teacher+from+student+pdf PDF link annotation
    • http://domilajen.22web.org/linux_system_administration.pdfIn PDF document text
    • https://rarozevalir.weebly.com/uploads/1/3/1/4/131437937/zoxatokigerajoduliga.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/fdKjeja/allo_allo_song_lyrics.pdfIn PDF document text
    • https://rifodajawu.weebly.com/uploads/1/3/0/7/130739776/3327124.pdfIn PDF document text
    • http://furunow.iblogger.org/25899172635.pdfIn PDF document text
    • https://dotawipe.weebly.com/uploads/1/3/5/3/135323210/638730.pdfIn PDF document text
    • https://cdn.sqhk.co/gukitane/hbo9DMv/overkill_3_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.pdfIn PDF document text
    • https://ragivigelogupow.weebly.com/uploads/1/3/4/5/134525503/40912c2a42a125.pdfIn PDF document text
    • http://takodevizol.iblogger.org/gaxuzizemixunogugani.pdfIn PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/lugolutaliwapafazij.pdfIn PDF document text
    • https://varigezizado.weebly.com/uploads/1/3/4/4/134480105/bufododigakuf.pdfIn PDF document text
    • https://dibevapanowodi.weebly.com/uploads/1/3/0/7/130776811/wovoburezoxixav.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/gegeic0/residual_value_of_a_car.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kodibonu.rf.gd/equation_editor_open_office_writer.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/97121237877.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/bahtsul_masail.pdfIn PDF document text
    • http://vinetewexe.epizy.com/caustic_3_unlock_key_apk_descargar.pdfIn PDF document text
    • http://jujewejono.epizy.com/wupuz.pdfIn PDF document text
    • http://rawatakutuju.rf.gd/lidolibaligovalotovula.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/35436215915.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_off0000f1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F6 5384 bytes
SHA-256: 9fb9460f99562817e225aef83c8a3f1c06805dc3124fa8d70076c85358d53775
font_01_sfnt_off0001041b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 10428 bytes
SHA-256: e6b9d61520a8d21536f5fd1cd2199a15399cc5858692e0a40ea5bc4301a34653

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