Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c54b53f5c38cc51…

MALICIOUS

PDF

82.0 KB Created: 2021-06-07 06:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 19f91b6283f2521fd9f699b2ff17f18c SHA-1: 166313892afe580ba076b541d86a164e057fad48 SHA-256: 9c54b53f5c38cc51aec1cd7635e6699feb8a3944adee9a56405b528cc578fc74
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute malware or phish users. The embedded URLs, such as 'https://allytemp.ru/pbw?utm_term=3d+car+drifting+games+unblocked', are the primary means of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://allytemp.ru/pbw?utm_term=3d+car+drifting+games+unblocked PDF link annotation
    • https://pasudavekeri.weebly.com/uploads/1/3/1/4/131437626/jawinezalawofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_60463f14298d4.pdfIn PDF document text
    • https://diwejixa.weebly.com/uploads/1/3/4/6/134629966/xosumofo.pdfIn PDF document text
    • https://kubazabuz.weebly.com/uploads/1/3/4/8/134885093/lokoratoridima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451028/normal_600ffd0e343d4.pdfIn PDF document text
    • https://vikuxujawud.weebly.com/uploads/1/3/4/5/134515409/seguxu.pdfIn PDF document text
    • https://jazujopu.weebly.com/uploads/1/3/0/8/130873842/b06d18ca1ff2364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390663/normal_60b9a4ece7c94.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/bibemafewuw-reridujoni-jigoduvojil.pdfIn PDF document text
    • https://nabebumiz.weebly.com/uploads/1/3/1/4/131452902/dalavi.pdfIn PDF document text
    • https://geguromivakof.weebly.com/uploads/1/3/4/3/134332909/dotavirodefapufukaj.pdfIn PDF document text
    • https://wogaresula.weebly.com/uploads/1/3/4/8/134888978/2776356.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/8d78d363ae2eac.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/lonilufedusubusatar.pdfIn PDF document text
    • https://pegepigav.weebly.com/uploads/1/3/4/4/134481067/jixadikagos.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://vananizi.pbworks.com/f/80226340998.pdfIn PDF document text
    • http://wikoborumun.pbworks.com/f/libro_de_formacion_y_orientacion_laboral_grado_superior.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/f/how_much_is_a_surface_pro_4_worth.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/f/roadmaster_bike_bd_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae14547-bfa7-44df-ae10-a511d404b34f/four_types_of_sentences_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f48caa-6ab7-4c8d-ba27-4cd17cf84dbd/garmin_nuvi_55_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/890f1443-9ec5-469a-8271-cbd0c2d1b397/zoom_h4n_recorder_specifications.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_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 5496 bytes
SHA-256: 36adec1fa4a931edbaeb05afd018a6c998991cb3b8b96afe82a00ac854c0165f
font_01_sfnt_off00010862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 10564 bytes
SHA-256: 56a60e4efbc6777d611bf8ef116aaf1749b6a13d96bc80a4e29299a30de62ecb
font_02_sfnt_off00012cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAC 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333