Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f1d608ba271f44…

MALICIOUS

PDF

72.3 KB Created: 2021-03-27 23:37:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1e5ef4dfe0a6f3e0e1637f1d57798111 SHA-1: 6ba3d0edf9a01a43e0b913322c639fe66b1295b7 SHA-256: c8f1d608ba271f44fe86a854c1491a1f9d1801a4b88555f496b9721b43582c6b
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs, including one that appears to be a redirector with a UTM term, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of external links and the overall heuristic firings indicate a malicious intent to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://lozipotod.ru/aws?utm_term=century+230+amp+ac+welder+manual PDF link annotation
    • http://stavki.link/pomimijisodisajgzfj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_602c789f7cd2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_60482f7adcdde.pdfIn PDF document text
    • http://all-system7.work/redofopimalorafizu7igha.pdfIn PDF document text
    • http://vizazovabula.mywebcommunity.org/98350653693.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/98280344750.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/ascanio_in_alba_mozart.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/494475849.pdfIn PDF document text
    • http://qlemelest.online/le_bistro_automatic_pet_feeder_manual0cziz.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/jiwume.pdfIn PDF document text
    • http://copyrightshelpscenters.com/cuenta_conmigo_pelicula_completa_en_espaol_latino_repelisvzzcd.pdfIn PDF document text
    • http://magicwoolshop.com/guideline_diabetes_mellitus_perkeniefelc.pdfIn PDF document text
    • http://healthytrands.com/factory_reset_tracfone_lgl15ga4rxk.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/sat_subject_test_qas_reddit.pdfIn PDF document text
    • http://kudikadip.getenjoyment.net/bronkitis_pada_anak.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/mr_coffee_espresso_maker_ecmp50_instructions.pdfIn PDF document text
    • http://center-about.com/uefa_champions_league_schedule_tvwh8u5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448116/normal_6040087c36d58.pdfIn PDF document text
    • http://rmk4sale.xyz/how_to_open_a_cannon_gun_safe_without_code7da89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476930/normal_5fdfd061910d4.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/8d7c448a-9874-47da-a667-88ee037873a2/bedirokazebedal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e66a90-100f-4eb3-a5d4-2b996130173e/tiwurajujelazewimut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e8079be-a988-473f-ac72-fd072893bcf0/rozukebux.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_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 5576 bytes
SHA-256: 6caab4befedc77f5f5c1ddc52a7e297ef988f87db7d0767ef554c09bfbeb4e8d
font_01_sfnt_off0000ed0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 10868 bytes
SHA-256: 3d0b8d48cd27e8f55f08b7d17cf17f58c96f01728e7e604917cb35fcefa4a06e

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