Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8be4551aae48d98…

MALICIOUS

PDF

84.2 KB Created: 2021-04-03 00:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ae8390dc8bb939897037c7bc819455ca SHA-1: e5a4273e8ac7df72e0b5b70b6fca71549de3f8e2 SHA-256: f8be4551aae48d98c0cf39e8f272c33e1d90f950bc83a80efd61f2bed0b931a9
206 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a malicious link farm, containing numerous external links to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple disposable domains and UTM parameters suggests an attempt to obscure the true destination or purpose of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://midufefew.ru/strik?utm_term=lg+transpyre+sim+card PDF link annotation
    • http://kapimivibix.22web.org/ketogenic_diet_meal_plan_for_weight_loss_free.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/pepotapososex-ligitem.pdfIn PDF document text
    • https://cdn.sqhk.co/tajugajobib/jg9ijid/xenuxoxadep.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/eid00Y4/bijekolavarutamupogeze.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/cgiU1e9/kadatozimosatir.pdfIn PDF document text
    • https://cdn.sqhk.co/dijexovesaf/PijMNr9/komali_movie_tamil_isaimini.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdfIn PDF document text
    • http://kopavavabigi.66ghz.com/acipenser_sturio.pdfIn PDF document text
    • https://gobodukigibab.weebly.com/uploads/1/3/1/8/131856162/jovilikurorileb.pdfIn PDF document text
    • https://cdn.sqhk.co/papazokixe/idmjbTZ/68485800675.pdfIn PDF document text
    • https://merusedezut.weebly.com/uploads/1/3/4/3/134361649/5715944.pdfIn PDF document text
    • https://renikafajuwigag.weebly.com/uploads/1/3/4/3/134317319/lasosegobuvef.pdfIn PDF document text
    • http://titagupux.22web.org/what_is_diverse_learning_program_development.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/ljhZhg0/android_phone_manager_app_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/wisaputal/hakfPih/dr_dave_janda_youtube_august_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/L6blhhg/margherita_pizza_ingredients_in_italian.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rokabimokow.rf.gd/71016883678.pdfIn PDF document text
    • http://rodigosixe.rf.gd/parsec_android_keyboard_and_mouse.pdfIn PDF document text
    • http://duzatip.rf.gd/hpi_baja_5b_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f110f82-ffaf-40f7-9254-cdcfa6dd3c12/the_book_of_birthdays_astrology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc72051-0be6-411c-a426-2e69058e8e9e/muxosamikosoxamodaf.pdfIn PDF document text
    • http://susesibukof.epizy.com/burma_film_video_songs.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_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 5404 bytes
SHA-256: 44b3a6260796335c0a3437dc9cbace68b9584667cc5f21b17914cb9bf6017cfd
font_01_sfnt_off00011ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB8 11916 bytes
SHA-256: 5c4590797031ae616407c01746ca0a80331745115a063ca89654b4d00d302638