Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a4fd4d8e5c3124…

MALICIOUS

PDF

73.0 KB Created: 2021-03-16 03:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 99baef1635e65fce121d758536e32f58 SHA-1: 3dcfc353d0375b7b06a95c8c9772175971a559eb SHA-256: a0a4fd4d8e5c312437f9bbaa2e37b9c56538e8cbe7d04ecc88b56f01e2c6c6c7
146 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, including one pointing to 'jumiwimov.ru'. The document body is heavily obfuscated, but the presence of external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a lure to external malicious sites. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jumiwimov.ru/123?utm_term=cindy+thompson+awurade+kasa+music PDF link annotation
    • http://feldhaus-klinker-plitka.ru/devexpress_report_edit_datasourcekc5jz.pdfIn PDF document text
    • http://vetebozo.mypressonline.com/how_to_calculate_instantaneous_velocity_on_a_graph.pdfIn PDF document text
    • http://monubagujizud.mywebcommunity.org/adobe_illustrator_reduce_file_size.pdfIn PDF document text
    • http://geosen.net/appendix_16_form_of_transfer_certificate342sz.pdfIn PDF document text
    • http://recepty-dd.info/ib_ess_ia_word_countjvhcv.pdfIn PDF document text
    • http://theporte.xyz/t_shirt_mockup_template_psd_free5wyxb.pdfIn PDF document text
    • http://lovelid.xyz/niduvujigewori1d0jb.pdfIn PDF document text
    • https://takogazaka.weebly.com/uploads/1/3/4/0/134017011/5e523.pdfIn PDF document text
    • https://zaxalaxixu.weebly.com/uploads/1/3/1/6/131606365/vugawovubavifajo.pdfIn PDF document text
    • http://momarivido.mypressonline.com/what_ink_does_hp_8620_use.pdfIn PDF document text
    • http://verenica.net/angelcare_baby_bath_seat_aldi69a52.pdfIn PDF document text
    • http://forexgeeks.net/cast_off_verb_formsgh7bc.pdfIn PDF document text
    • http://vovodofozufora.iblogger.org/popoto.pdfIn PDF document text
    • http://nigasutoxik.22web.org/national_5_english_sentence_structure_questions.pdfIn PDF document text
    • http://bowoluzin.iblogger.org/rodawinexafexufazovap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mifumupesa.rf.gd/eso_asylum_sanctorium_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/limegawimubuverasike.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/19821059248.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/76032363948.pdfIn PDF document text
    • http://bexovivuvere.myartsonline.com/sample_descriptive_paragraph_about_a_place.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/45061823496.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_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 5444 bytes
SHA-256: a7ecd69a7400495bfa3555c861060c07f0e99273f51420d5c3035b0649a764e3
font_01_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 12236 bytes
SHA-256: 0badcaf5e05d07fd993196e2e9da13b90d8d07a1e0c663e9e0d79b8cceb724e4

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