Malicious PDF — malware analysis report

Static analysis result for SHA-256 451f6cd05c15aae0…

MALICIOUS

PDF

87.0 KB Created: 2021-01-14 22:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e87a18e1f9e89811c6809889e1a69739 SHA-1: a4f7d7aca400f068b5c0050b8166a2c628a9e349 SHA-256: 451f6cd05c15aae0ec258043a6fd03dcaba907f4dce7c59d43d6175bdb014f78
184 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to 'marsupials'. The presence of numerous links hosted on disposable domains suggests a link farm designed to distribute malicious payloads or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/wb?keyword=top%2010%20interesting%20facts%20about%20marsupials In PDF document text
    • https://cdn.sqhk.co/gituridewo/hSJfAjb/air_hockey_challenge_apk_hile.pdfIn PDF document text
    • https://cdn.sqhk.co/jofutagi/ihBJigO/baker_business_3_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/hgibGaA/skype_free_video_call_app_download.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/1ed75.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/veruvi.pdfIn PDF document text
    • https://kodowogokilikid.weebly.com/uploads/1/3/4/4/134466607/wigitiv.pdfIn PDF document text
    • https://site-1166621.mozfiles.com/files/1166621/tojewulaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_5fe9c86826b6b.pdfIn PDF document text
    • https://zojokoladateru.weebly.com/uploads/1/3/4/4/134497877/nikag.pdfIn PDF document text
    • https://wufewevaso.weebly.com/uploads/1/3/1/4/131453291/safosojuterawel_solifininagu_fefuwudizub_jewatobo.pdfIn PDF document text
    • https://site-1172508.mozfiles.com/files/1172508/filmywap_2019_kabir_singh_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/ZP1Fcjb/gemurumavukuna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xupimaral/50044845902.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/wumusorovelemodonixi.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_off00011654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11654 5620 bytes
SHA-256: 24fc774eff5e5b41f8918df1049d7baa25351811c660844f7253de33390bf1f7
font_01_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 11604 bytes
SHA-256: fe657f90014d5f6c2425e97d60678b5017273f587e6ae10c825368dd0e5649f6

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