Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6772b272282b212…

MALICIOUS

PDF

73.6 KB Created: 2021-03-07 22:34:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6465995f43a9b635a608581694eafb87 SHA-1: 6f474d1b2c850bc132c189f2b2dd241c33b91c53 SHA-256: c6772b272282b212bda3f5d6ba373c1b27745a252f8f1f9681a2f91099c6af30
244 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a redirector link and a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/strik?utm_term=what+is+statistics+in+simple+words In PDF document text
    • http://student-yurist.ru/candide_voltaire_englishkblqz.pdfIn PDF document text
    • http://gallery-shop.site/55825994172wc46i.pdfIn PDF document text
    • http://hookup666.site/big_bang_theory_evolutionir3jj.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/python_while_loop_list_length.pdfIn PDF document text
    • http://nodururivaxekik.22web.org/76765628617.pdfIn PDF document text
    • http://vajesafosedepur.mywebcommunity.org/bagivoxazuroziwojeki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/41bb0182-5865-4a29-949d-cb0bc31d0efc/34577707912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52d32c5d-2044-4b4c-879a-054716dc2061/hp_laserjet_pro_400_color_mfp_m475dw_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d28bad56-5e1a-4e5d-a21f-e7738331175d/how_to_set_time_on_casio_world_time_telememo_30.pdfIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_1291f9c31e6a4df3a16bdeaaf1d48ff8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba99fbde-d123-4dab-8d68-e823a455b259/95428755681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63807d96-9f45-4944-ab59-a30eb9c7e1be/53832954945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee78983-2c1b-4e28-bfa0-22f0db705efb/dell_latitude_e6410_i7_windows_7_pro_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/426d4fc2-5617-4542-85eb-342e397956d2/37783432172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b861892-1825-4d18-95e4-4b76349d7111/bryant_plus_90_inducer_motor_replacement.pdfIn PDF document text
    • http://kabuzore.atwebpages.com/whirlpool_water_softener_cleaner_home_depot.pdfIn PDF document text
    • http://bimemelal.epizy.com/96329605228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d08e0b7-683c-4250-a31a-69bd8d10727b/15774895417.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_fff493bf7ea24618ae0953fcf3c9383f.pdf?index=trueIn PDF document text
    • http://sivokag.epizy.com/pevogulujanox.pdfIn PDF document text
    • http://zolivowubek.epizy.com/fifty_shades_of_grey_full_hd_movie_download_movies_counter.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_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 5420 bytes
SHA-256: ba748fed07ed54fb279d78015e851a17b91bfb5ae3dbaae59f7373a283f6d981
font_01_sfnt_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 10244 bytes
SHA-256: 601655c2e8909c493ca6c88850ee8abdfd7d5ff4f7e1eaaef254f9e558e53cf8