Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da1cf37f9e41f73…

MALICIOUS

PDF

84.5 KB Created: 2021-03-13 13:33:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: d9f3a9add521d1bb8b7cea1339a430eb SHA-1: ad5d217f30a99ce333740b5af34bd0feacd59df0 SHA-256: 3da1cf37f9e41f73d041c80088283dabea8d28eedb2f8f05a48b12a489d6498b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, contains text related to 'Whatsapp messenger apk download for ipad', suggesting a lure for potentially unwanted software or phishing. The presence of numerous external URIs, many hosted on disposable domains, further supports a malicious intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/wix?keyword=whatsapp+messenger+apk+download+for+ipad PDF link annotation
    • https://cdn.sqhk.co/vedisaso/GRahjie/free_bigasoft_total_video_converter_portable.pdfIn PDF document text
    • http://instapriz24.online/keranoclilf.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/lhhgcgi/tipaduzizedaxafenugakofer.pdfIn PDF document text
    • http://yblda.fun/firobopebesezel43ra.pdfIn PDF document text
    • http://roman-holidays.shop/origami_books_for_beginnersbbjns.pdfIn PDF document text
    • http://instas.site/jumping_spider_habitat_for_sale5erc4.pdfIn PDF document text
    • http://prizinsta.site/8280753386c432o.pdfIn PDF document text
    • https://cdn.sqhk.co/rukububibon/tC2gjhc/teddy_horror_game_apk.pdfIn PDF document text
    • http://grandov.pro/31404977340ea5nm.pdfIn PDF document text
    • http://afracheat3.xyz/fivuvanugaretepidkvz1.pdfIn PDF document text
    • http://zhk-samolet-krasnodar.info/dell_latitude_e7450_original_chargerkrubf.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/42542293350.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/jcjjgjG/guess_the_disney_theme_song_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c7193de9-0843-4958-a0d8-8d853205917d/cen-tech_battery_charger_63423_review.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/rosedevolodikola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20b539d-4d54-462f-8d4c-da026a1e279d/51237960885.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/how_to_clean_drinkwell_mini_pet_fountain.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/appointment_email_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/649bb628-fd32-4dab-8345-81219392b380/hp_deskjet_6940_driver.pdfIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/buwuvexelipidimif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd234af-8987-4410-916c-319be13f379e/98093728820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bbbddd2-42bd-4771-87ef-64953c102add/tcp_ip_the_ultimate_protocol_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 5412 bytes
SHA-256: f79009b6b4d107e7e45d8b2ff6a11cfd832d23d1464da4d8dc07fa4b47cd4d11
font_01_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 11908 bytes
SHA-256: 9824f338d5fe96070a8d864a2102c095bfe62e592fa6868b7eaf86b422603088
font_02_sfnt_off00013664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13664 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71