Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b28d96f4f4a5079…

MALICIOUS

PDF

80.3 KB Created: 2021-02-28 09:15:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5359cd26215a600b13e022d3cb93572a SHA-1: c53f8d895d6f75aa285f43d4ab519bdb0b5bc162 SHA-256: 3b28d96f4f4a50799e2c3991e24e2fa39cdcae5ef509d9afcb247d9dd1de30e4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely involving JavaScript execution within the PDF viewer.

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://lozipotod.ru/award?keyword=is+south+indian+food+good+for+weight+loss PDF link annotation
    • https://cdn.sqhk.co/kukugejekibi/ehb97Nh/julopaxazeralipuzafisenan.pdfIn PDF document text
    • https://cdn.sqhk.co/vizebika/1Q0we0Q/73055674015.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/raspberry_jam_canning_recipe_with_pectin2nc7h.pdfIn PDF document text
    • https://cdn.sqhk.co/gubalugotu/jdsghjj/steel_and_flesh_mod_apk_revdl.pdfIn PDF document text
    • http://sayfelengs.space/toro_workman_3200_parts_listdeuao.pdfIn PDF document text
    • https://cdn.sqhk.co/nujorazaje/ifcjjhj/jemuwoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_602dd2519bdbc.pdfIn PDF document text
    • http://presente-top.store/99302446932kq3s3.pdfIn PDF document text
    • http://micrometer25bill.site/49528164290shqgj.pdfIn PDF document text
    • http://hookup157.site/boomboxx_i_dey_instrumentalov69z.pdfIn PDF document text
    • https://cdn.sqhk.co/mikitikotak/fEWgjUX/43659172978.pdfIn PDF document text
    • http://reduslim-europa.site/safety_first_alpha_omega_elite_car_seatdt9n5.pdfIn PDF document text
    • https://cdn.sqhk.co/wixumenez/hjhfFnu/youtube_video_downloader_for_uc_browser_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/pomiziluda/jiNLibf/79156372864.pdfIn PDF document text
    • https://cdn.sqhk.co/laripikiwafo/uyPhbha/47700363936.pdfIn PDF document text
    • http://prostosite.site/how_to_change_my_address_on_my_health_card_in_ontario4xanq.pdfIn PDF document text
    • https://cdn.sqhk.co/rukeditele/9Ohhhil/acg_video_player_download_for_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/ggROjg2/download_toca_life_school_mod_apk.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://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_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 5080 bytes
SHA-256: 35ac95f892867040e8163ff341e598fba6da17f63ceb1d0cea6df4213ae0d073
font_01_sfnt_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 9984 bytes
SHA-256: fde74f46982ac51ff44c90a35d59f2d9f4ce2676aa735c744a9a0b468d9f82ac
font_02_sfnt_off000125f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F5 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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