Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b70e4b7cb3edde…

MALICIOUS

PDF

79.0 KB Created: 2021-05-03 09:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 428c8cc0372a6cb8cdf0fb611207c018 SHA-1: 28f4bd5aae5ef0661930466b1bc82ae459bddc11 SHA-256: d9b70e4b7cb3edde550b7daad5cf5334236d1167005d886bc855225ad9740af4
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the overall structure and URL distribution align with a link farm designed to direct users to malicious sites. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=do+you+need+a+developmental+editor In PDF document text
    • https://cdn.sqhk.co/nukusigemug/kggZibv/neuron_labeled_picture.pdfIn PDF document text
    • http://wamipivifubape.sportsontheweb.net/xarudanuvubumajuvowama.pdfIn PDF document text
    • http://susurrus.space/nusuvapuzuvazamexinuvigqwhna.pdfIn PDF document text
    • http://kopalirigel.mypressonline.com/fiberena.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/solid_waste_management_nptel.pdfIn PDF document text
    • http://kekedisinodorul.iblogger.org/fapanebi.pdfIn PDF document text
    • http://gixanexebo.22web.org/16490550337.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/ftA3jie/best_hashtag_generator_app_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/vukixukafoga/MpjiQEn/b_w_companion_hitch_for_ford_super_duty.pdfIn PDF document text
    • http://fruitslope.online/malala_the_powerful_themezwupe.pdfIn PDF document text
    • https://cdn.sqhk.co/tidilotofuka/iaihvXC/deep_fitted_bed_sheets_double.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/Qhhnha9/parow.pdfIn PDF document text
    • http://liketime.fun/26986886108o8lxv.pdfIn PDF document text
    • http://samettemiz.xyz/dna_replication_transcription_and_translation_worksheetax04v.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/kDjiSid/bimiwevu.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/blasphemy_law_in_pakistan_in_urdu.pdfIn PDF document text
    • http://durasazi.iblogger.org/2018_forester_sport_grill.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/MJhf8Bb/joplin_weather_forecast_hourly.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/zubuwujoxom/gakala.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/is_percy_jackson_in_the_lost_hero_book.pdfIn PDF document text
    • http://makeromevoju.rf.gd/61864481329.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/diego_rivera_historia_de_mexico_de_la_conquista_al_futuro.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_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 5088 bytes
SHA-256: a0c305714f63e7a7ad5b3c91e91d50a95c86cf91f6c94f45afcf1cf943b9746e
font_01_sfnt_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 11100 bytes
SHA-256: d566453e67bb6673b2b28cbbd20849d9380901533c065532e75bb0f7a08a3e00

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