Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3d5b25c92da717…

MALICIOUS

PDF

142.1 KB Created: 2021-03-22 15:34:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7ac3173e45230b41f608ffbc223121ce SHA-1: eadbb214715cac22fefbf59f6186ac4274ce9e7c SHA-256: 6b3d5b25c92da71747935a7a1f892210cbd807ce8bea7b404e7fcd8e4ff5a321
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a potential lure related to an 'asiana plane crash report'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting an attempt to obscure malicious destinations. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/123?utm_term=asiana+plane+crash+report PDF link annotation
    • http://lizuzezusad.medianewsonline.com/christmas_choir_music.pdfIn PDF document text
    • http://mpvideo.org/voginifavodagapokamawiju6rx2s.pdfIn PDF document text
    • http://vofokifuzujusi.iblogger.org/motorcycle_3d_model_free_obj.pdfIn PDF document text
    • http://xizerunax.scienceontheweb.net/pathfinder_2e_character_sheet_fillable.pdfIn PDF document text
    • http://lerasusakibura.22web.org/8381688536.pdfIn PDF document text
    • http://kubosikavudux.mygamesonline.org/stereochemistry_of_addition_reaction.pdfIn PDF document text
    • http://grantmedica.ru/zasazojufozowodilirizufoso1ls.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/xiaWhcl/4th_grade_math_constructed_response_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/fopavege/djaOVBZ/ableton_live_9_suite_plugins.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/rifoxadik.pdfIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/vororosorotajowinamikitad.pdfIn PDF document text
    • http://fojosotum.myartsonline.com/definition_of_data_collection_in_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/655dc1e1-f105-4995-8e5d-b56af2533dcc/red_jumpsuit_lyrics.pdfIn PDF document text
    • http://luxajoja.epizy.com/skilsaw_15_amp_7-1_4_in._circular_saw_w_24t_carbide_blade_certified.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e82ca49b-b6db-43ce-9e7f-c97f13e3e70e/how_to_create_a_website_in_wordpress_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/394e1667-d560-4b18-bc61-880eb74b6de0/cateye_micro_wireless_manual_espaol.pdfIn PDF document text
    • http://jumebesatupa.epizy.com/mopac_performance_parts_edmonton.pdfIn PDF document text
    • http://wujagenak.atwebpages.com/tanatologia_veterinaria.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
stream_004_off0001ba38.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BA38 16708 bytes
SHA-256: 12f70c9255a1c170e9b77ad07f9ffc29a3fab902c8fb598e9291d48da160bbba
font_01_sfnt_off0001f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F00A 5008 bytes
SHA-256: e7740aabc485d2db362ab1a1c120da65044305167f6ed26259f6f76b95b6160f
font_02_sfnt_off0002010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2010D 12080 bytes
SHA-256: a4b09585d84b0fbff1b4cfb1f0627b103007db09b13454ca5fdff0b7c70a1df1

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