Malicious PDF — malware analysis report

Static analysis result for SHA-256 2491a090f680c921…

MALICIOUS

PDF

85.0 KB Created: 2021-03-23 15:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e10211a33c71771d555d1bdae2d81891 SHA-1: 61d3b3b4ab9b5c0840ac2a244f3b9bb93c874e78 SHA-256: 2491a090f680c92185743866ffb4740aa5e873ae3b495c3c990ce6a9645909b5
226 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or spam document. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains tokens that hint at command execution, and embedded URLs are present, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://nipisod.ru/award?keyword=how+to+blur+background+in+photoshop+cs6+pdf PDF link annotation
    • http://shopeuro.pro/leisure_bay_spa_partsggebt.pdfIn PDF document text
    • https://solekavugixe.weebly.com/uploads/1/3/3/9/133999951/9138587.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/iigibia/tubing_in_colorado_river.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/d7vU8ha/commander_cody_lego_figure.pdfIn PDF document text
    • http://getplafond.xyz/nietzsche_genealogy_of_morals_essay_2xxcmd.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/bernina_830_manual.pdfIn macro / runtime command snippet
    • https://gonufefimexej.weebly.com/uploads/1/3/4/8/134892828/207394c6b4.pdfIn PDF document text
    • https://susejovidexoxi.weebly.com/uploads/1/3/0/7/130775922/fedakadir.pdfIn PDF document text
    • https://ribekafov.weebly.com/uploads/1/3/4/7/134761657/nidutilegotazome.pdfIn PDF document text
    • https://cdn.sqhk.co/mamidusidozu/jdidhiM/learn_basic_spanish_to_english.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/IJhcPmq/best_captions_for_pics_with_sister.pdfIn PDF document text
    • http://tunabamilusi.mypressonline.com/geological_time_scale_2020.pdfIn PDF document text
    • https://noremovex.weebly.com/uploads/1/3/4/8/134883944/pesunobedifodif_zukijenonolur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d911d48-c5a8-4c00-902a-573655ac5781/nimugapobuwedilolik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b93050e-94b2-4573-ad20-f2817a8fbe03/59409235031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b07dfd-296a-4b76-afcb-27f7858e2b68/watch_the_pit_and_the_pendulum_1991_online_free.pdfIn PDF document text
    • http://lavoxema.onlinewebshop.net/21327234551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07d57288-69eb-4d32-8e8d-2c7e7b5084be/how_to_oil_euro_pro_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d7368ba-3782-4d96-8fc9-ca71a1bec005/komagakitetuzobilido.pdfIn PDF document text
    • http://vekisofekibote.myartsonline.com/17108183554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf071af-80bb-406d-8b37-13b124164dfd/lisolisujolawuxokefopek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3be97a2-8108-4746-8a2b-eabdef0fb8a6/digital_marketing_evening_courses_dublin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74156bbb-f7da-4ab0-a6b4-3b63c1e557e8/resokufov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec990374-40d7-4482-a3fa-1f91660fc0ab/how_to_pair_turtle_beach_bluetooth_headphones.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
    • https://uploads.strikinglycdn.com/files/07d57288-69eIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF0 5828 bytes
SHA-256: 10259f57594ea324eea4913a739a36ed25a1228fad64c252f73070c17f06e36d
font_01_sfnt_off000121ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CA 10732 bytes
SHA-256: 2edda71f351e53a65f1ce4c9c31f5e58b78f99b08d207dfdf12c338471e9f1c0