Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21e8f3a05b26d99…

MALICIOUS

PDF

79.1 KB Created: 2021-03-20 07:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a1b02388920bc40344943f81df96b1b7 SHA-1: 690e09a5f594e2e226557e8f39d98faf23b38a70 SHA-256: b21e8f3a05b26d99c28f452fc6a15c75bebb64fff77f075649cb5e3f26a39192
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to salary information, likely to entice clicks on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=what+is+average+salary+in+alabama PDF link annotation
    • https://cdn.sqhk.co/repipedifavi/giUjj6i/thorough_definition_sentence.pdfIn PDF document text
    • http://taxezobojoxa.iblogger.org/dd_wrt_router_setup_repeater_mode.pdfIn PDF document text
    • http://sodalabs.pro/how_to_take_pictures_on_lg_phonex1ze8.pdfIn PDF document text
    • http://myluckywin.site/operating_system_concepts_essentials_9th_editionm25b8.pdfIn PDF document text
    • http://vabodulesofife.22web.org/kalugoxelarurul.pdfIn PDF document text
    • https://cdn.sqhk.co/mipijotom/IDagdxP/tafodupojatuvemideja.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/fjcOpVW/ball_games_online_unblocked.pdfIn PDF document text
    • http://waxodotira.22web.org/12541718227.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/c0xim0Q/77262075315.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/fYihgjq/vukotazopetota.pdfIn PDF document text
    • https://cdn.sqhk.co/lolumebitana/ansUXJq/cfo_meaning_real_estate.pdfIn PDF document text
    • https://cdn.sqhk.co/ladetozuxi/HJfiaHZ/pancake_recipe_with_self_raising_wheat_flour.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/cUjccTV/28806156084.pdfIn PDF document text
    • http://apeech.ru/89785644806m78gk.pdfIn PDF document text
    • https://cdn.sqhk.co/nixenexax/1hhnH0f/black_acrylic_nails_short_square.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/4a30f812-5355-43b0-8947-c80430095109/how_to_change_color_on_p_touch_label_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/032a6822-fac8-472d-bcd7-92d0dc09d51a/newukoxawigafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a84f9c-4ddc-4b93-8bf8-e6aaf1afc644/calories_in_arbys_greek_gyro_sandwich.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1921a56-57fe-43fa-8544-02ddbf657694/a5_browning_serial_numbers.pdfIn PDF document text
    • http://mizebonemis.rf.gd/cna_schedule_template.pdfIn PDF document text
    • http://bixoravu.epizy.com/94725999550.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/call_of_duty_advanced_warfare_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/new_moon_january_2021_central_time.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_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 5416 bytes
SHA-256: 9727d09633a0d8f27012e4c1c4a145fcdd2a867856f5c61adf03cd77dfd905df
font_01_sfnt_off000107b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 11060 bytes
SHA-256: 44467a3eb5b19fa2e707edd0bb9fd40d734d4e94f4eefd910482df38ebc90038

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