Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc84363236de8a2…

MALICIOUS

PDF

81.5 KB Created: 2021-03-28 00:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4ec98547a315ec38db6b23e7936c8809 SHA-1: d3c759c6695c660485a6c6d5e9c16a507fbf1214 SHA-256: 7dc84363236de8a20462ca7b9648157658036cf59682f6359bb987bd7b4c11bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to disposable domains and a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the link farm structure are clear indicators of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://leonvi.ru/award?keyword=branding+definicion+pdf PDF link annotation
    • https://cdn.sqhk.co/nisisepolo/hWjaHhf/vajodakivofogimodela.pdfIn PDF document text
    • http://nominasacra.ru/calculating_percentage_increase_and_decrease_worksheety72j4.pdfIn PDF document text
    • http://kihepc.xyz/275646650847fiq7.pdfIn PDF document text
    • http://todayshop.website/11775710311pfws4.pdfIn PDF document text
    • https://gaburidukir.weebly.com/uploads/1/3/4/4/134463400/66b9fd689152bb.pdfIn PDF document text
    • http://miiliioner.xyz/openpilot_cc3d_firmware_downloadgcg42.pdfIn PDF document text
    • http://amorexpo.com/sdge_billing_cyclefblhb.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/f0O3hd2/neousys_nuvo-_6108gc_price.pdfIn PDF document text
    • http://ch-redirect.icu/the_chocolate_touch_book_freek62e6.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/teachers_guide_science_8_quarter_3gzqwu.pdfIn PDF document text
    • https://cdn.sqhk.co/mewowoji/FghQRpU/dungeons_and_dragons_online_free_dlc.pdfIn PDF document text
    • https://didunoduwogu.weebly.com/uploads/1/3/2/6/132682107/dewiwebetarutu.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/noselupuzekiv-todapobire.pdfIn PDF document text
    • http://ctuxuu.com/48989343860enu6b.pdfIn PDF document text
    • https://cdn.sqhk.co/lupokuna/CjKidih/engineering_entrepreneurship_course_syllabus.pdfIn PDF document text
    • https://gawopina.weebly.com/uploads/1/3/2/8/132814119/kuluvalatewalaji.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/Ykjjvje/mx_player_pro_apkpure.pdfIn PDF document text
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/juniminavokusur_ranopufemosiz.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
    • https://uploads.strikinglycdn.com/files/6bc84f7a-569e-4aee-9a73-a41b5846ffbc/rurewone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4587d8c-8a12-4a16-b7c4-d91fa46dad7f/79823608583.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/misagirenesubefemugumof.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/assassin_s_creed_games_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00697d20-7904-44f0-a38a-994108813b3a/vedemavitese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0171528-7f30-412b-b15a-4be04f0589ae/asus_crosshair_iv_formula_ethernet_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/a_raisin_in_the_sun_movie_online_free_2008.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
font_00_sfnt_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 4872 bytes
SHA-256: a6b3e7453547b25dfe5b2fc6551fd8ad2abba2c05ec494b31d9e4c40bc564f18
font_01_sfnt_off00010489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 11788 bytes
SHA-256: 24ce5e3a6489ad751a3bfedf517a9bcc7fc90e0f60242da0c2caccb9db3dc66f
font_02_sfnt_off00012a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71