Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a22d8b0ac576ff…

MALICIOUS

PDF

81.0 KB Created: 2021-03-28 10:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 38faad3b4d8e3f94393281fb9bbd5323 SHA-1: 303ee0aca4e711e4153abd1bb83409e92e7c6a67 SHA-256: 40a22d8b0ac576ff00a614423a736db01d90b9b2e4772477f7edecb04f792bc5
126 Risk Score

Malware Insights

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

The PDF contains multiple external links, with a high concentration on disposable hosting, indicating a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document, likely delivered via spearphishing, designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://kuzutuzo.ru/wix?keyword=dna+replication+coloring+worksheet+answers PDF link annotation
    • https://bitepurumuxuz.weebly.com/uploads/1/3/1/3/131378930/suterik.pdfIn PDF document text
    • http://tidivon.iblogger.org/is_the_boy_in_the_striped_pajamas_on_netflix_usa.pdfIn PDF document text
    • http://pr-bux.online/car_driving_simulator_drift71tzf.pdfIn PDF document text
    • http://nerroba.info/what_happens_in_book_6_of_harry_potterq9b1x.pdfIn PDF document text
    • https://wisixujedos.weebly.com/uploads/1/3/4/7/134732494/ferulolasug-zebela-rezobekupoj-pivides.pdfIn PDF document text
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/5980885.pdfIn PDF document text
    • http://profit-makers.club/how_to_have_a_good_rap_flowepqsr.pdfIn PDF document text
    • http://rowomonug.mywebcommunity.org/timex_indiglo_watch_straps_india.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/526948106203ve70.pdfIn PDF document text
    • http://lotiruwibek.iblogger.org/elementary_set_theory.pdfIn PDF document text
    • http://yachts-4-sale.com/should_there_be_water_in_my_water_softener_tank86v6z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pusapovewazigu.onlinewebshop.net/zomopewagejikog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f896b7f2-37bf-4e60-944e-cd76a61cea22/identifying_irony_when_mr_goodenwell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53431d66-4131-421b-a3a0-af30429e2a89/excellent_definition_and_examples.pdfIn PDF document text
    • http://bumilofu.rf.gd/fugirusupixemokadisad.pdfIn PDF document text
    • http://vejimugar.epizy.com/12769578477.pdfIn PDF document text
    • http://gupizamowakop.myartsonline.com/puremo.pdfIn PDF document text
    • http://kakavogulogij.onlinewebshop.net/igcse_english_as_a_second_language_coursebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96dc112a-8932-4db7-b27e-eca6d4e22673/how_many_digits_in_a_nj_drivers_license.pdfIn PDF document text
    • http://zuwopun.rf.gd/japuvidugotejekerenosokub.pdfIn PDF document text
    • http://litopojijerel.epizy.com/xobozilarekarenap.pdfIn PDF document text
    • http://nimunofat.epizy.com/52877723443.pdfIn PDF document text
    • http://midotujeg.rf.gd/75024125403.pdfIn PDF document text
    • http://nazowovemozugiv.myartsonline.com/sql_join_statements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af63f9c-4e27-42a7-a34b-8d56337be45c/34665941.pdfIn PDF document text
    • http://zitovidenelanus.rf.gd/tavonediraritamibizuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99cf0861-6532-4038-ba82-3374c77d9c95/yamaha_01v_manual_deutsch.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 5140 bytes
SHA-256: ba8ded5e1877a78a29aadcadbbcc8460bd4a760979a64c6251e5d077bcd50da3
font_01_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 10812 bytes
SHA-256: 081a7ee41b41f50ed09f7d5df03d65f7a5cbfb42672248d6a50205739ef2e414
font_02_sfnt_off0001261d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2