Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a1563369c88054…

MALICIOUS

PDF

79.7 KB Created: 2021-06-09 19:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c4470b45171155d460d172adc5484272 SHA-1: ced70a20a4543ffd0a6ab4cb2eda9f3a57aabaa1 SHA-256: 22a1563369c8805460509b1025750b50ff26eccdec7308e02f943e98d041074c
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nomylo.ru/pbw?utm_term=cafe+racer+android PDF link annotation
    • https://pezobarifad.weebly.com/uploads/1/3/5/3/135394950/zovixuv-diwexenapez.pdfIn PDF document text
    • https://rebageronamit.weebly.com/uploads/1/3/0/7/130775484/2753aac81e0444.pdfIn PDF document text
    • https://dafavazama.weebly.com/uploads/1/3/4/8/134893815/jizuraputamajot_mukumug.pdfIn PDF document text
    • https://xosotujusosevo.weebly.com/uploads/1/3/4/3/134377620/woliruzufewid.pdfIn PDF document text
    • https://xirozakopep.weebly.com/uploads/1/3/4/7/134719339/sejilukomuwuxewebut.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/91a9a624-586b-474a-b8e6-b6eb51f436d7/how_do_you_cook_pinto_beans_in_a_pressure_cooker.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/f/broken_vessels_sheet_music_free.pdfIn PDF document text
    • http://zudilazo.pbworks.com/f/functional_specification_document_in_sap_fico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11bc294e-e01d-4aba-9396-630a23009601/rugefexu.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/avatar_the_last_airbender_2_full_movie_free_download_in_tamilrockers.pdfIn PDF document text
    • http://bunemirudezo.pbworks.com/w/file/fetch/144647217/comprehensive_radiographic_pathology_workbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05806c6a-6ea7-4df2-a981-51b74c31c955/meruvaliwax.pdfIn PDF document text
    • http://zixereves.pbworks.com/w/file/fetch/144917754/vukarorojuluziw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/200da757-cffa-445e-919e-bbe3e5870649/administering_meds_through_feeding_tube.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/f/17625158273.pdfIn PDF document text
    • http://sovamexor.pbworks.com/w/file/fetch/144660849/41290441839.pdfIn PDF document text
    • http://ridelox.pbworks.com/f/27298027325.pdfIn PDF document text
    • http://didaneguk.pbworks.com/f/50989855438.pdfIn PDF document text
    • http://wotasaful.pbworks.com/f/13_thirteen_2010_full_movie_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6720c8e-721d-403d-ab10-8066692c6c15/what_is_the_hardest_ninjutsu_in_naruto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a05b74fb-c787-4148-915b-ad33c6eade2e/91116787356.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 4712 bytes
SHA-256: 710a74f0289d502539f5c725bfe448e35e90414163009ae5202fe72202ff793f
font_01_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 10860 bytes
SHA-256: ecadd16e47edf1b43ea5ef16fd193d73afde709796909159f11e8feced1d3639
font_02_sfnt_off00011c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5F 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501