Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bad42fc201c3f3a…

MALICIOUS

PDF

78.5 KB Created: 2021-06-11 03:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1a40053b0c406418e109b112979885a3 SHA-1: 40b32a2ead381818cb2a7901c814e4837e6208d4 SHA-256: 9bad42fc201c3f3a237f1e87882d9ff73f8e9bd279d0b444ca45a624f71c0888
186 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to various external resources, with a prominent link suggesting a download for 'videoshow pro apk'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing unwanted software. The presence of numerous external links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://smidgel.ru/pbw?utm_term=videoshow+pro+apk+download+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407781/normal_60492af2bd7e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412382/normal_5ff10b582d0f6.pdfIn PDF document text
    • https://wokimexerevup.weebly.com/uploads/1/3/7/5/137516918/tezinubedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476751/normal_603bb9966627e.pdfIn PDF document text
    • https://tabekobos.weebly.com/uploads/1/3/4/8/134869214/satunupubabamipege.pdfIn PDF document text
    • https://rofoxanubojinud.weebly.com/uploads/1/3/2/7/132740779/9873718.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepadatoju.pbworks.com/f/78383415293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a8c0df8-7be4-4da0-ac4d-e2465f4a6aa9/concord_furnace_ignitor.pdfIn PDF document text
    • http://bajaduxaxusi.pbworks.com/f/49342142872.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/w/file/fetch/144797439/how_to_replace_grill_burner_tube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a1dee5-3e51-4a63-9eff-97c82411c8a7/la_estructura_de_la_magia_vol_i._richard_bandler_y_john_grinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd0aabe4-ff76-406f-a533-bb5ecce041a2/vuvuxoragatofesezejonuno.pdfIn PDF document text
    • http://rezedul.pbworks.com/w/file/fetch/145016967/jung_theory_of_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26eccb24-efcf-46c1-87ec-60c4720569ba/65867852674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e9e7b4-b7e6-4d6f-bb6c-4e00c866ecf7/what_does_sat_subject_tests_not_offered_on_this_date_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4695bdbb-73e4-46ec-8ff5-8469a23e6cd3/35813172882.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/w/file/fetch/144669561/formulas_para_convertir_de_una_escala_de_temperatura_a_otra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cad6861-d47e-4238-992d-7dc5fe9eafc1/verotitod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29695e4-8274-425d-adfc-1ca1795581bd/how_do_i_love_thee_short_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a1c791-e8c0-458d-bc52-d874ded28aa0/fofuzunexadewok.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 5252 bytes
SHA-256: 62b379d6d14f50915408b6a439ca2231bdf4ad55764205d4a8e0d987d3b8c556
font_01_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 10536 bytes
SHA-256: b95082b8611de7e8f1538821eb97d8569dd336dc917d835ac87054f3274218ea
font_02_sfnt_off0001178f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178F 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848