Malicious PDF — malware analysis report

Static analysis result for SHA-256 585b5c09cc3f7e83…

MALICIOUS

PDF

76.7 KB Created: 2021-03-28 15:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 21b97114fe220b3ce5e129f61f6cc0f7 SHA-1: c50c54551039f1e6da927b686732e75491bb6e24 SHA-256: 585b5c09cc3f7e83e07094353ae98f662bd0a96e179ed7d5161260d6a48dcca9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://gimoguvi.ru/strik?utm_term=onkyo+ht-r340+specs PDF link annotation
    • https://cdn.sqhk.co/jokawefezo/iCAhhia/sijedidapulidepuwudobo.pdfIn PDF document text
    • https://cdn.sqhk.co/migixurej/cjcslhf/luxury_brand_management_free_online_courses.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/xuruzepovidixuflpo98.pdfIn PDF document text
    • http://newyearshop.site/araro_ariraro_kannada_song_freegqi44.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/serid.pdfIn PDF document text
    • https://cdn.sqhk.co/gipekoma/RQjeiit/18798087246.pdfIn PDF document text
    • https://cdn.sqhk.co/worenora/kZjjhcH/16511547127.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/qhdib3l/wish_me_happy_birthday_song.pdfIn PDF document text
    • http://requiremcgood.com/bible_theology_books_in_tamilezqao.pdfIn PDF document text
    • http://lbaranaydin.com/307334403449y8wc.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/d7d91211-9dbe-4b41-8caa-630049f96553/66076082020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e544dc6-8ab7-4959-ac37-09744cde32d8/rarekibezupizikugulili.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/how_to_cook_a_turkey_in_the_big_easy_oil_less_fryer.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/gowamamufek.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/whatsapp_video_call_recording_app.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/tamil_full_movies_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2283200-f103-4050-9eda-bb739eebdfc4/can_i_use_verizon_hotspot_with_unlimited_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/899f6f21-4cce-42a8-82d6-6face6e4410f/hp_pavilion_dv6_battery_price_in_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71989bf2-bbaf-481f-a4d6-00269abbbcad/labuzexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ae70f2-602e-412b-9287-c77bc09a558e/what_does_flashing_battery_light_mean_on_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e1e23fe-33da-406d-81c0-be34a7d89286/sakezufudepakov.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/befutuzowum.pdfIn PDF document text
    • http://wugetad.myartsonline.com/operating_system_concepts_9th_edition_powerpoint.pdfIn PDF document text
    • http://pefimubis.myartsonline.com/aircraft_mechanic_course_in_tesda.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_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 5396 bytes
SHA-256: ffd5e04521cbb2d8bccbe8a47ef5a41809b54c2d896360bdd93c600ad53d863e
font_01_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 11492 bytes
SHA-256: 3e7885369ccbdf22b0ce6a4b9c013a0ea9196b6ed37f57541c0ebb3c8cb86727