Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b782ba573c5125…

MALICIOUS

PDF

76.9 KB Created: 2021-04-15 10:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 741db42868f4c56a24217ed223623e5b SHA-1: 56225770c51e17170e83b8718b02a1aa82059696 SHA-256: 11b782ba573c5125ecb956341eaa2feb7c1b96c817260492420d198cc6a93e76
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains numerous embedded links, many pointing to disposable hosting services, designed to create a link farm. One critical heuristic indicates these links lead to known malicious redirector infrastructure, specifically mentioning a URL containing 'garmin+94sv+plus+manual' as a lure. The ML classifier also flagged this PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, appears to be a garbled attempt at presenting the 'Garmin 94sv plus manual' lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://yafferge.ru/strik?utm_term=garmin+94sv+plus+manual In PDF document text
    • https://cdn.sqhk.co/sobutexe/hdih0CI/cute_cartoon_wallpaper_hd_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/jhgc0kV/63452005168.pdfIn PDF document text
    • https://cdn.sqhk.co/jojipimuve/jpIRhcJ/certificate_template_word_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/jfhdRYy/crazy_eights_card_game.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/Ahghche/christian_songs_about_walking_by_faith.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/vimudoporelikuwizelofowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471481/normal_60258e6aa30c7.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/hihb3y1/69505387237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_606e2332f08a6.pdfIn PDF document text
    • https://cdn.sqhk.co/nevowokazem/crqhhgj/forming_adjectives_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/jbhbERs/muse_music_playing.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/huHhahi/download_major_mayhem_2_cheat_mod_apk_happymod.pdfIn PDF document text
    • http://wamabivunufoteg.medianewsonline.com/ejercicios_angulos_y_rectas_1_eso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_4b54518cd9324dfc8a01589ff97d46f0.pdf?index=trueIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_1a2855e2d30b4e938fd0d1e2e7359e19.pdf?index=trueIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_7572563c7cc94e5185c92e44d046a2bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82004f21-4bb3-48da-b710-072311d63236/18088950261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e6f0310-f246-453c-998b-ef37f4bea364/golodopivapudegali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f71beefa-80bf-4323-a841-253ee0481fe8/free_half_ironman_training_plan_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bb596f-d250-4df8-a08b-7304708352d3/who_makes_simpson_power_washer_engines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c156a98-5d3c-4a70-8adb-6ffea49cae1e/tubamif.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_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 5300 bytes
SHA-256: 33b2c805adfad4cc4220e4f68a97fdb7d5d6924f7ea8838f15c79b5d30e5e852
font_01_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 10580 bytes
SHA-256: 04901e525f4ff23f82920ef598c95411de4340fac7c4af24edf4ba6fe6de6155