Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b70757bfbb32d3…

MALICIOUS

PDF

75.4 KB Created: 2021-04-06 17:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4df4f2d4052df250832e6fe4cbf6e5ed SHA-1: 63a0254d27bc1e71f32447984f1e9791c9bddf8e SHA-256: 23b70757bfbb32d30a0a7b46b928713aea85679e9fe3ee1c8dc507080b32012d
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 high-confidence ML classifier and ClamAV detection, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure strongly suggest it's designed to lead users to malicious content, likely for credential harvesting or malware distribution.

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://fokemale.ru/strik?utm_term=how+to+measure+electric+range+drip+pans PDF link annotation
    • https://cdn.sqhk.co/puvegipuros/agcLgc2/debedexurogugevipiw.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/dJpid00/48186734542.pdfIn PDF document text
    • https://cdn.sqhk.co/purorenutuw/ez8QAje/amazon_prime_cyber_monday_movies.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/jchaidw/fiwekakupowogubavijujoso.pdfIn PDF document text
    • http://muwazowezijowa.22web.org/wallpaper_hd_for_android_mobile_avengers.pdfIn PDF document text
    • http://gimexataga.iblogger.org/did_god_turn_water_into_wine_or_grape_juice.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/319f5907-fbc2-408c-a601-2e3812653d99/62585630409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/334c7ae8-5d20-41c5-919c-39c4a630c200/54665785387.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/allocation_chomage_formation_pole_emploi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ff470da-874b-4a42-88f2-52e7bac2a10c/why_is_there_2_the_girl_with_the_dragon_tattoo.pdfIn PDF document text
    • http://fonaxipovun.epizy.com/38421953081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5d1234-9fc9-445e-82c3-c89c73ff71d6/warcraft_2_movie_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/easy_crochet_toy_patterns_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e95efb73-21d6-4bf2-8c60-04996e990ed6/52365707405.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/20467952893.pdfIn PDF document text
    • http://wefusav.rf.gd/83538311540.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/94791216168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b0d4a6-2546-4c6e-b9e4-3f556ba14069/wenorirapufon.pdfIn PDF document text
    • http://galusuvojames.epizy.com/les_miserables_staged_concert_cast_list.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/ultrasound_guided_subtalar_joint_injection_technique.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/anemia_falciforme_caracteristicas.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/warobumegusaginuwomonel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4249537-b83a-408e-8962-2d92dc4961bb/32099408228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/179d9df5-28bf-477e-8c0a-f90d2a5fedd5/80091102449.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/amazon_prime_chromecast.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_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 5448 bytes
SHA-256: 28374c849b430cc3cabe6050a4343459d0913a26a5930a26191266ab41ed88c1
font_01_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 10620 bytes
SHA-256: 5d8fdd91e1b7d19bb7418bfb4fcded24ccabfd4b796d99284c7233184d0edc0e