Malicious PDF — malware analysis report

Static analysis result for SHA-256 925c78c33d312b1c…

MALICIOUS

PDF

84.8 KB Created: 2021-03-31 00:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 11b4904b439cfd6c18ad93424ad4b70e SHA-1: aa88b14876bc360693eacf0c3615433dff375cb5 SHA-256: 925c78c33d312b1cb03e3745005e59b0758fcee2dbad1e512429dc7f842260c7
184 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 known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to PDF creation and potentially misleading keywords, reinforcing the lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=best+pdf+ebook+reader+for+android+tablet In PDF document text
    • http://toppiksnack.xyz/56035197469eq1ye.pdfIn PDF document text
    • http://atlas-copco.su/atlas_copco_fd30_air_dryer_manualprxvz.pdfIn PDF document text
    • https://cdn.sqhk.co/wunemuruk/cRgjgh2/harvest_moon_light_of_hope_guide_ios.pdfIn PDF document text
    • https://gefobivuvevu.weebly.com/uploads/1/3/1/3/131380717/9f7ea0d95f6e.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/kabozo.pdfIn PDF document text
    • http://savineme.mywebcommunity.org/organic_chemistry_reagents_cheat_sheet.pdfIn PDF document text
    • http://sarupunojupud.sportsontheweb.net/lapoluju.pdfIn PDF document text
    • http://pavawafupef.66ghz.com/uc_ipm_pest_management_guidelines_almond.pdfIn PDF document text
    • http://zuwigef.22web.org/context_clues_worksheets_4th_grade_multiple_choice.pdfIn PDF document text
    • http://bettermoneytips.com/85353988886on0ng.pdfIn PDF document text
    • https://zafapuguma.weebly.com/uploads/1/3/2/7/132712217/zuvebikuz.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/berichtsheft_vorlage_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/jghaVif/my_boy_gba_emulator_full_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/wegodimumod/diicrja/40801911194.pdfIn PDF document text
    • http://thefortykuti.com/jbl_flip_3_bluetooth_speaker__get_tws_mini_earpod_freek1hnm.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/denaleseriwolibulu.pdfIn PDF document text
    • http://prazdnikprosto.ru/g_shock_gd_100_alarm2sq0n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jalijoruki.atwebpages.com/70993716844.pdfIn PDF document text
    • http://gubodasitonobu.epizy.com/hide_worksheet_in_excel_using_vba.pdfIn PDF document text
    • http://gifixutazopoja.epizy.com/john_deere_d170_deck_parts.pdfIn PDF document text
    • http://lojaxafolato.epizy.com/capacitor_start_induction_motor.pdfIn PDF document text
    • http://pigutun.myartsonline.com/how_do_i_reset_my_samsung_tablet_10.1_to_factory_settings.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_off00010a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 5288 bytes
SHA-256: bfc6eaac285e17d01594dfb3f5fad80db1350b756e80a7ee42fa6c601e935329
font_01_sfnt_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 11656 bytes
SHA-256: 51eb007359a063431b74ed2ce7a52a0654ece9a97d178126ae17bde1120143be