Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a5b51138326cb5…

MALICIOUS

PDF

75.6 KB Created: 2021-04-09 21:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8b541366e037fb1b0c3939b09495dd66 SHA-1: 2046c51b9061d3f31f8da64893c541c4243a9a6e SHA-256: 53a5b51138326cb5ca34bfb1b2ee3571e130ef7852be329c9fa86fb7abe25ca5
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically pointing to a driver download lure. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The ML classifier also flagged it with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=m-audio+fast+track+pro+usb+drivers+windows+7 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403283/normal_5fe381fb46f00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466143/normal_5fd0aa3cc7488.pdfIn PDF document text
    • http://didazema.mypressonline.com/how_to_adjust_burner_on_gas_water_heater.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_60478cff1325e.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/dotusidafasurov.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/periodic_table_black_and_white_a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458854/normal_600bda95e2f62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372086/normal_5fe1c1013991d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_6016613984cb6.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/253a001a-8cd8-4ddf-a6de-7151115739ea/how_do_i_fix_a_gas_fireplace_pilot_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0888352a-330e-40c7-9a01-597945fdb21a/40949541912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb82d99-4ce8-4ba0-8cb2-abeb27416174/where_is_the_tropic_of_cancer_located.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/exerpeutic_gold_975xbt_recumbent_exercise_bike.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/bushmaster_ar-15_model_xm15-e2s_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/pleco_chinese_dictionary_apk_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/43184365143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71cecdd7-4248-4b9f-9b66-ab9fc25e9fb3/zedujupirosoru.pdfIn PDF document text
    • http://lajovaputap.myartsonline.com/la_reina_de_los_caribes_emilio_salgari.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/eccentric_person_crossword_answer.pdfIn PDF document text
    • http://luvetux.myartsonline.com/wezorewuzipadezelifebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bac635d-70df-4f3e-8d20-3498adbd09cd/sandisk_mp3_player_bluetooth_pairing.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_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 5588 bytes
SHA-256: 79601b726b262dcb6d5d1ca36d0128a709a222e192ba3296b6c17d843d83f36c
font_01_sfnt_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 10796 bytes
SHA-256: f866ea14aaffcbc609fe77324cd25349ef48baabf6372b5dfa8132415be8baea

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