Malicious PDF — malware analysis report

Static analysis result for SHA-256 304dfab9e6a5af75…

MALICIOUS

PDF

85.9 KB Created: 2021-05-14 01:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 81a1a278bbc1022675512319a10294af SHA-1: 415937db9c4b7bd6c4e160ee256aa48a8b28a58d SHA-256: 304dfab9e6a5af75a98a5cfcda3bee99571d25284e7857a61d66592b725f5957
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a prominent one leading to 'zajinet.ru' which appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to search queries, suggesting a lure to a malicious site. No scripts were extracted, but the overall structure and URL usage point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=is+it+ok+to+ignore+someone+who+hurt+you PDF link annotation
    • http://jafixane.iblogger.org/tosisotuko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413718/normal_5ff56ce633da8.pdfIn PDF document text
    • http://zomuregunaradu.iblogger.org/45836775043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381971/normal_5fe302860414a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_5fe9f758932d2.pdfIn PDF document text
    • http://klokisik.space/antonio_gramsci_optimism_of_the_will5h9ro.pdfIn PDF document text
    • http://waxenotesanil.22web.org/star_wars_clarinet_sheet_music_free.pdfIn PDF document text
    • http://gevazuvunurodum.22web.org/91589586561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408333/normal_604f86096a94c.pdfIn PDF document text
    • http://rewita.fun/29215546062afnr.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/9fec4807-d6a5-45d4-ba85-cd226030a3e5/35987193996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8a834d2-c368-40c1-8ada-c0b7d9da7595/utilitech_3-outlet_digital_countdown_lighting_timer_manual.pdfIn PDF document text
    • http://xadebomuf.rf.gd/guider_meaning_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d9eaf38-a3fe-4020-8bd3-cecf60b80a1e/android_game_development_javascript.pdfIn PDF document text
    • http://jizivaj.epizy.com/pride_and_prejudice_1980_full_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb1a28a9-b3cb-47e6-ab17-800ad83aecb2/gangnam_style_video_song_download_full_hd.pdfIn PDF document text
    • http://fenukasoroxido.epizy.com/picaduras_de_insectos_tratamiento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f520ef08-0f18-4f75-be28-00e937d96307/mejufafulixuxaxetokum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a72263a6-c1ab-49fe-a471-5ecbb98b130c/the_magicians_season_4_alice_and_quentin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa9371d7-e8b7-420b-975d-e413462bfd58/gepujifefu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 5052 bytes
SHA-256: 3be293aac754b803b2c6bedb6f1ee3049037ec2bf0d2f53aafc7f056989ac3b0
font_01_sfnt_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 3340 bytes
SHA-256: 68ec2f4a6cf2d1a68abc64adf19b41d3ba9921e119b670940064b0625553cdb7
font_02_sfnt_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 11116 bytes
SHA-256: b0e09b4b7da7edc7cddab3d7d94b36526910909c93132bc20ee469368cbc2ff3
font_03_sfnt_off00013520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13520 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550