Malicious PDF — malware analysis report

Static analysis result for SHA-256 809605da97ea4717…

MALICIOUS

PDF

79.5 KB Created: 2021-03-05 09:31:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 88d2a1240d1a8498a20c302e00f3b4cc SHA-1: b6b3ca3465f34e1a85bbe3715513b85afaf98c1b SHA-256: 809605da97ea47173e93e46dfd431454b9e0e89b41cff6c6ff96e6039e9944fb
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'Dr Heidegger's experiment study guide answers'. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=dr+heidegger%2527s+experiment+study+guide+answers In PDF document text
    • https://cdn.sqhk.co/vibisidumes/icZjeja/tutemifonukonunirami.pdfIn PDF document text
    • http://fewudutizoxom.medianewsonline.com/what_food_has_alkaline_phosphatase.pdfIn PDF document text
    • http://tawexowupa.22web.org/another_word_for_listening_to_someone.pdfIn PDF document text
    • https://cdn.sqhk.co/kitijorawul/gjZifhi/tik_tok_funny_video_short_clips.pdfIn PDF document text
    • http://gemobaraza.iblogger.org/49125048667.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/aswb_practice_exam.pdfIn PDF document text
    • http://vafijevimam.iblogger.org/credit_note_format_xls.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/sundance_optima_flo_error.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sulosuduvemog.epizy.com/diablo_hellfire_sorcerer_guide.pdfIn PDF document text
    • http://vibiruguwotugo.rf.gd/physics_for_scientists_and_engineers_4th_edition_knight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e2da56d-5c86-47e9-898c-bcd3dd840674/kenworth_t270_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c7f9546-d628-4fd9-976a-88e1ebf5d610/prince_charles_net_worth_2019_forbes.pdfIn PDF document text
    • http://pajamubo.rf.gd/human_fall_flat_xbox_guide.pdfIn PDF document text
    • http://benebobuku.epizy.com/secured_remove.pdfIn PDF document text
    • http://jetubomubiko.epizy.com/59844775113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/632dce56-1351-487e-ae0c-4da514c408ca/mitesekopemifar.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/miminedakanosofu.pdfIn PDF document text
    • http://viwuleraxukopiz.epizy.com/mobile_battery_charger_app.pdfIn PDF document text
    • http://golunelew.epizy.com/baahubali_telugu_movie.pdfIn PDF document text
    • http://kugexuluke.epizy.com/3215280808.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_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 5636 bytes
SHA-256: 5d68cdf6a13d97ac005fdc30622e76262160a3998778718fddefeb1e5866fe37
font_01_sfnt_off00010d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0D 10208 bytes
SHA-256: d453d6e81229901ff6f85a578e3f33840f422a608a6438c531da7c3f9f2bb5b3

Open this report in the interactive analyzer, or submit your own file for analysis.