Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e40914f1e3b01b…

MALICIOUS

PDF

86.4 KB Created: 2021-05-07 22:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cbb783bffcbaf6594ae47b1898d50538 SHA-1: 03b3eb4b2e5067d158e0035484d78ea5f2060a20 SHA-256: a9e40914f1e3b01becfa4b185106dd306d1baf026d3cc82bb80d01b80450c5f6
146 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document body, though heavily obfuscated, contains a URL that appears to be a lure related to search queries. The presence of multiple external URIs and link farm heuristics further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://xezojetit.ru/strik?utm_term=what+is+the+best+samsung+phone+car+chargers PDF link annotation
    • http://wotevolodux.iblogger.org/ge_4-device_universal_remote_control_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/tipadasa/eq6hgc5/adobe_photoshop_cs6_camera_raw_8._3_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/ihf2hf2/superhero_bmx_racing_simulator_game.pdfIn PDF document text
    • http://tixarofisaru.22web.org/academy_stars_2.pdfIn PDF document text
    • http://zilixijabukepul.iblogger.org/what_is_the_most_popular_tool_used_in_agile_software_development.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/varoximu/likulenogakiwuzatolizagup.pdfIn PDF document text
    • http://xewaditina.epizy.com/2020_nfhs_baseball_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e5beb3-5e54-428b-8f89-e8060e0adc4a/jack_reacher_never_go_back_2016_yts.ag_subtitles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50841f01-28dc-4bfd-8917-c5dc6a7967d0/79493861852.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/sefikipugipowedetoxelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ab6676-c6f4-48ef-98bb-20a155fd2749/tcp_ip_model_internet_layer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f7ef90e-378f-42cc-8aaa-ee06cc90068e/27422154276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e571bd5b-6c53-4cc3-9cd5-746fdb3bda1a/internet_gratis_para_celular.pdfIn PDF document text
    • http://gelidug.epizy.com/94068143725.pdfIn PDF document text
    • http://surozegefixo.rf.gd/97035253445.pdfIn PDF document text
    • http://zitotinew.rf.gd/xabanisi.pdfIn PDF document text
    • http://gekuxexotomilo.epizy.com/basic_finance_questions_and_answers_for_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/metenirojebedusez.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/22732537959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80024443-5186-4dfb-b7ed-9664a4478cfd/xazeve.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/schematic_diagram_of_autotransformer_starter_dol_starter.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_off00011321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11321 5468 bytes
SHA-256: f24f61e903dfd7e61855432b1f1007a80511815d2176afe60cf9b5392b7207e0
font_01_sfnt_off0001259a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 11368 bytes
SHA-256: c6a001e28d294d38c4a61ab8fdfc479f7b9e9d86f70193d77a58fcf1774696db