Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1c48b396e19e15…

MALICIOUS

PDF

70.2 KB Created: 2021-03-24 03:11:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 762df6228eb074c1a32d9bcc392a5df7 SHA-1: cd73abd18007470f64be10e7c3126d67eafe8c29 SHA-256: 7d1c48b396e19e15910fc327f3360b473ad0c6991a0a604cdd74db2abbc8279f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text fragments suggesting it's a lure for specific search terms, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=o+come+to+the+altar+chords+pdf+e In PDF document text
    • http://lutafem.getenjoyment.net/supapoxonilu.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/iiaIwje/73228685348.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/hgjhihb/argentina_visa_application_form_mumbai.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/by_the_seat_of_my_pants_definition8ad5a.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/hb6hjgd/6461238146.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/kibovumalibagof.pdfIn PDF document text
    • https://girakojazesu.weebly.com/uploads/1/3/4/6/134675992/zarusedibubaxonafexe.pdfIn PDF document text
    • https://pezofonarumupub.weebly.com/uploads/1/3/5/3/135396673/0c748c.pdfIn PDF document text
    • http://gmetry.online/what_was_the_origin_of_species_about29eik.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/cjbuIhf/brain_training_games_improve_your_memory.pdfIn PDF document text
    • http://13millions-warzone.store/dsl-2750u_software_updatey7exf.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/idOchgn/download_aplikasi_gun_shot_fire_war.pdfIn PDF document text
    • http://priz24.site/how_do_you_get_a_royal_crown_acnhv0dan.pdfIn PDF document text
    • https://goguzosuv.weebly.com/uploads/1/3/5/3/135343726/belegonogiwutol.pdfIn PDF document text
    • https://gebezemimubitup.weebly.com/uploads/1/3/1/0/131070169/sezisikerinefarixu.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/18529811509.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/4bfc07c0-1372-42bb-b123-92f2365b96f8/give_me_liberty_textbook_answers.pdfIn PDF document text
    • http://tudixuzaw.onlinewebshop.net/john_grisham_the_guardians_series.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/amazon_android_app_store_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f2f720-e8f0-420d-a5e9-7ec840b4c36e/womoxezifaxidesugiwuduniw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a636fe61-cbee-4d97-a925-87d2cbd6ea75/31811585739.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/actividad_epileptiforme_ictal.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/58844665777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42770eb-2c17-4beb-983d-28bfe7ed1471/bushnell_laser_rangefinder_yardage_pro_sport.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_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 5424 bytes
SHA-256: 36b1dbdbedc9a60b04280ede89ebce274d880e383fc1ad64f9e372ad44dce3d9
font_01_sfnt_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 10460 bytes
SHA-256: ac977bcbd695922675d7e045a89c5002dbce09eb2b554975c66ca3744da72aa3