Malicious PDF — malware analysis report

Static analysis result for SHA-256 110b454abf59b55f…

MALICIOUS

PDF

75.6 KB Created: 2021-01-23 01:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8c33d7d3c80d4e4ab59fa1024c1c4d24 SHA-1: e93c477f9cfda4be9e2058fb309eb5df3e7c320f SHA-256: 110b454abf59b55fac0e467377d4cf5e3e8e33ab5fcdbac3378de0b33be8da66
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=rodeo+stampede+apk+cheat PDF link annotation
    • https://cdn.sqhk.co/rujiwujik/8I0jbgg/mahadev_video_status_download_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/9Lf7Yha/filov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412767/normal_5fd896e2a6abe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380545/normal_6007ee2cdc369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_5fdab858b07c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413983/normal_5fd39e0130b6b.pdfIn PDF document text
    • https://cdn.sqhk.co/toralapiluw/hcIjcK0/4146204918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468536/normal_5fd67061e7d10.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/iiirjbP/bemivujibudojukagipepun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420745/normal_5fefc692d4b03.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/3eZ2IVf/among_us_mod_menu_2020._9_9_happymod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nolumuj.epizy.com/the_compound_microscope_worksheet_answer_key.pdfIn PDF document text
    • http://poresiz.epizy.com/all_of_me_ukulele_chords.pdfIn PDF document text
    • http://kavisawadafo.epizy.com/kariwibopibupebufene.pdfIn PDF document text
    • http://surotatifezuxe.rf.gd/kingsoft_spreadsheets_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/49370519202.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/writing_instructions_worksheets_grade_5.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_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 5256 bytes
SHA-256: f5267c8d027bdc0276f5526bfca7a4b413fe749a5a89a3baf34968a00d01bf55
font_01_sfnt_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 11552 bytes
SHA-256: 9754d06760787b421fe7df25c36f951fd1832831298fa03d06bc6460b428caae

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