Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f23342a850b8c8…

MALICIOUS

PDF

77.7 KB Created: 2021-03-10 12:56:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 49f12ab5614cd9fe807dca55d8a568e2 SHA-1: 96775d13d9789d285195d6b88b5f18b772ee4927 SHA-256: 13f23342a850b8c868cf3b2da7b37c0bcf79a68f3e9dbb621f3b2db077753c50
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 0.9997

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 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://mezovuduw.ru/wix?keyword=portland+summer+baseball+league PDF link annotation
    • http://copyrightsupportforlnstagram.com/automate_android_app_exampleso2r2m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_601abadbdec9b.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/8634ab9aa626ac5.pdfIn PDF document text
    • https://xabetujozuveko.weebly.com/uploads/1/3/4/6/134682227/71bb13bd6.pdfIn PDF document text
    • http://gachihyper.xyz/mastering_biology_chapter_5_answer_keymem53.pdfIn PDF document text
    • http://xbet1.fun/99074954583gr5c8.pdfIn PDF document text
    • https://rowigimafusapop.weebly.com/uploads/1/3/5/9/135982222/fa88545.pdfIn PDF document text
    • https://junimadegerozo.weebly.com/uploads/1/3/4/0/134096607/gavewopawor.pdfIn PDF document text
    • http://springwin.space/233627034850zsmu.pdfIn PDF document text
    • http://sayseedokg.com/doterra_price_per_drop44frs.pdfIn PDF document text
    • http://helpverifybadges.com/calligraphy_script_styles3grsa.pdfIn PDF document text
    • http://lg-copyright.com/kixavugabamokuxiku3aa8y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485704/normal_6039a5195ba89.pdfIn PDF document text
    • https://vowagogo.weebly.com/uploads/1/3/5/3/135307183/7e12eb6dbf2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufixel.rf.gd/bakotazoworusud.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/entomology_multiple_choice_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/alarm_ringtones_for_heavy_sleepers.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/selami.pdfIn PDF document text
    • http://jaxarafepemu.epizy.com/letterhead_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/74251883483.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/puwuzoxojubexe.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_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 5288 bytes
SHA-256: d75284656329bcfca0c228d9d55b04de4cc10b5531fdc3a0c8eaef476ea95c6c
font_01_sfnt_off00010511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 10644 bytes
SHA-256: 4ad70da5eb5bd5347e5e5daa125dabc805c4ff2952a9094cf88122de0132ba23

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