Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae7822c4e8a0fdb…

MALICIOUS

PDF

70.8 KB Created: 2021-02-15 23:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 721e80d40ca4c4025d25e5915e0dbc43 SHA-1: dbe915c468bce663ee8a56a2e8e4b603ccbdf7d2 SHA-256: 6ae7822c4e8a0fdb7fe5978a82d81aaee14764892c77cc57682d8c1775b074a6
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and exhibits characteristics of a social engineering attack. The document body, though heavily obfuscated, contains references to 'Windows ctrl commands not working', likely a lure to trick users into interacting with embedded links. The PDF also contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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.
  • 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://leonvi.ru/strik?utm_term=windows+ctrl+commands+not+working PDF link annotation
    • https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/ec457dc8.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/fhgtxih/grumpy_cat_hot_weather.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/Xjhia1A/76173448529.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486984/normal_5ffbac44a3572.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/6f7314eb5672f.pdfIn PDF document text
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/fefuxevugaw_vukire_xusefuma_laziz.pdfIn PDF document text
    • https://tojabefe.weebly.com/uploads/1/3/2/3/132303019/jitojenugusojifidute.pdfIn PDF document text
    • https://tidukefawa.weebly.com/uploads/1/3/4/8/134851120/bizigasulifexo_lukanetuja.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/wedifuw_fomiteniwiriru_tikerobepepipow.pdfIn PDF document text
    • https://pulijapejupexeb.weebly.com/uploads/1/3/4/0/134041872/nilina_pejujumulog_sufeganopet_moxos.pdfIn PDF document text
    • https://cdn.sqhk.co/vopupevomate/0GggULc/flexiroam_x_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wisivelu/thdQVf0/17234174816.pdfIn PDF document text
    • https://xalifabosivibu.weebly.com/uploads/1/3/0/7/130775217/salomonewolax_ramokodit.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/higwfif/space-_hippo_asteroids_space_survival_arcade_game_download.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/f8107b22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410201/normal_5fed9d593329d.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/degisapemifa/odia_song_free_video.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/54398029308.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_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 5428 bytes
SHA-256: f04df7ef2219149aee79c889a6e414f579dd52ef150dba0e93cf3cc8f7aafb53
font_01_sfnt_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 10348 bytes
SHA-256: e80801a3cd0647d859f7517f6b6fd121c50fbb7b3ce19e311d98b09fea89e73c

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