Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd25b54cf65ca55f…

MALICIOUS

PDF

75.7 KB Created: 2021-02-22 19:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 881e946711c05c226188c2c8fed6b50d SHA-1: 77c5a032f976e54f69039d030756d7338f1738d9 SHA-256: dd25b54cf65ca55fcddd3cf8604fde7413ffb962ce5b22cda36847523517914b
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute further payloads or conduct phishing. The embedded JavaScript stream further supports malicious activity, likely for obfuscation or redirection. The primary attack pattern involves luring users through a seemingly innocuous document to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/wix?keyword=evolution+by+natural+selection+worksheet+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5fff3ccf4f2c1.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/hgeMq4q/space_decor_dream_home_design.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/5X4DPM9/vuvokukiveziziso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417814/normal_60295ce5e84b2.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/iejfgfz/daniel_powter_bad_day_music_video_actress.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450242/normal_6015819d1e908.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/gj1aokx/sound_equalizer_software_for_windows_xp_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381291/normal_60036d396b65b.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/nomaxubotejozasud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_600fdefa2aa76.pdfIn PDF document text
    • http://lagimuzovixur.iblogger.org/nomukotivovigobakepos.pdfIn PDF document text
    • https://kitaterikobojim.weebly.com/uploads/1/3/0/9/130969176/zumasejovumexif.pdfIn PDF document text
    • https://dunevija.weebly.com/uploads/1/3/4/3/134306837/gugis_zoxetulu_wibuzemuzosa_nunafufijul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450427/normal_601a0fe5d448a.pdfIn PDF document text
    • https://cdn.sqhk.co/tatiwurixiwo/alUjjcC/the_maze_a_labyrinthine_compendium.pdfIn PDF document text
    • https://cdn.sqhk.co/xetilibul/ihzyOQM/movistar_venezuela_planes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5fdc0fda6d531.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pemukusa.epizy.com/kedagolem.pdfIn PDF document text
    • http://wojudor.epizy.com/affinity_photo_free_full_version_mac.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_off0000eabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABC 5300 bytes
SHA-256: b14815505654a3f6726bca66774b6c24e88fa9cfed254027fdcdbf2aba795905
font_01_sfnt_off0000fcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD9 10800 bytes
SHA-256: a2177154532950ef8ef180071159ac9804c12cd4e960eca364be470f50990c52