Malicious PDF — malware analysis report

Static analysis result for SHA-256 82565516d5a87866…

MALICIOUS

PDF

80.3 KB Created: 2021-03-29 21:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 66c6a5d350a2005e497586b16433ad52 SHA-1: e1f29d06554e3214147d2f36082fa51847a3e1a5 SHA-256: 82565516d5a8786688151e1cb84736c36c954623a81606f6017ec477091180e4
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=android+restart+again+and+again+problem PDF link annotation
    • https://povaginomoti.weebly.com/uploads/1/3/2/7/132740536/bb67d4491921e65.pdfIn PDF document text
    • https://rezemofojo.weebly.com/uploads/1/3/5/3/135321986/553671.pdfIn PDF document text
    • http://molipetofokeva.22web.org/79011640859.pdfIn PDF document text
    • http://revifuk.iblogger.org/young_living_essential_oil_reference_book.pdfIn PDF document text
    • https://livabobuladezer.weebly.com/uploads/1/3/0/8/130874084/taxofobiparimi.pdfIn PDF document text
    • https://roboxojepuz.weebly.com/uploads/1/3/4/2/134235986/361891.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suserige.rf.gd/laboturedujiteda.pdfIn PDF document text
    • http://desuvusemexemob.epizy.com/23694683434.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/saudi_arabia_flag_coloring_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/bihar_police_constable_bharti_2019_online_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff530e78-e2f1-4d75-8eb6-488cc3a876a7/wizojelisunuguvuwaf.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/kuxorezevotinitulovabum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21433023-2e4b-41a6-bd4a-08c58e6c70f4/59494008664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb737501-eea5-4d78-b46e-aa2f29020e39/xegadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ee395f8-1fed-4284-90e1-77280c74e176/norelco_s9000_prestige_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b1ef37-ff97-4264-8c72-442ff5d8d2ba/extraordinarias_mujeres_de_la_biblia_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/avlis_formation_avis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7eea95b-cbbe-4f65-b532-c73c545f85c0/how_to_change_transmission_fluid_2012_chrysler_town_and_country.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/55703006719.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/tesadifixujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cfa2e98-36c4-4bbf-9ba7-950b304600c7/winuletajevikelaxim.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/76232508618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83be7ba0-e2ba-4f9c-afd2-785da0ad1d11/zasevaxajarifub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb404ae-faf2-4f1c-bc49-3248c78ddb76/calculus_early_transcendentals_solutions_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac4b7b75-d32d-4b04-a5ca-90fe3eb6d787/william_tyndale_translation_of_the_bible.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_off0000fb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4A 5408 bytes
SHA-256: a1fe83e882d110bed3b8430d0e95c4653871fbd8dae71c7e1d4390900e28e394
font_01_sfnt_off00010d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D93 11164 bytes
SHA-256: 85940293f3963b0f65251ed4527fcc33550eb8293141a887c80639b7e3580190