Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d66e2b6055b8df…

MALICIOUS

PDF

74.4 KB Created: 2021-02-22 21:14:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc376a8abe99d5a9481d411a6d2c8b1b SHA-1: 9491a1fc61013b6ab76970d70aa36e4203f902d6 SHA-256: 99d66e2b6055b8dfcdcee8a4430e24a15d7aa33616e09be51e91d124c4776f80
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure or are part of a link farm designed to manipulate search engine results. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to malicious infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=samsung+smart+remote+control+manual
    • https://lezevonunibo.weebly.com/uploads/1/3/4/5/134577944/fisowisuturukow.pdf
    • https://cdn.sqhk.co/gotubosif/h1lwhiU/kodiak_island_bear_viewing.pdf
    • http://dujaliz.iblogger.org/gerund_or_infinitive_exercise_1_answers.pdf
    • https://cdn.sqhk.co/muribirigim/jhhaIOT/xabuliposidojivonaxureb.pdf
    • http://fruit-italy.space/best_camera_app_for_androidh0yt2.pdf
    • https://cdn.sqhk.co/wegodimumod/JhjLUih/space_heater_home_depot.pdf
    • http://imedo.ru/can_i_sort_worksheets_in_excelrqq7x.pdf
    • https://wemupubipu.weebly.com/uploads/1/3/5/3/135331653/8d7abd77.pdf
    • http://serviceforyou.site/pengenalan_agama_islamutky0.pdf
    • http://helpcontactform.com/what_is_the_domain_of_social_work_researchdqjbu.pdf
    • https://gitikaru.weebly.com/uploads/1/3/4/9/134901111/7262359.pdf
    • http://gebajajax.22web.org/46176294442.pdf
    • https://cdn.sqhk.co/mudemodox/gjejdhf/stop_categories_word_game_online.pdf
    • https://cdn.sqhk.co/janawezexoj/ggLGMAE/1016858285.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://wotonopeg.epizy.com/52440243168.pdf
    • http://nidawijonag.rf.gd/bodybuilders_motivation_videos.pdf
    • http://saxuvoluzoz.epizy.com/black_dog_led_zeppelin_drum_sheet_music.pdf
    • http://pewaxoxepizus.rf.gd/abacus_airline_booking_system.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f8.bin
21435c96f483661b51aade10072883aac6913579ef5a12199cf542c9029f2de5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F8 5056 bytes
font_01_sfnt_off0000ea05.bin
66ae73df24c8473a7028dec4d6703fd04436fc679793c0c34fd640bd1096f69e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 10664 bytes
font_02_sfnt_off00010e55.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E55 4324 bytes

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