Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1766ad4fd5199dc…

MALICIOUS

PDF

69.5 KB Created: 2021-02-17 03:52:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f6cee4f4b6ebd8cbf571d0739c57e87d SHA-1: 923472859cbeb4c0aee1d3dfb9b57c0ed8f081db SHA-256: b1766ad4fd5199dcef2828c747d3e03ba194dee33138269f77f47275f6799911
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm heuristic suggest the document is designed to redirect users to potentially harmful websites.

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/strik?utm_term=clinical+pharmacology+book+online PDF link annotation
    • https://cdn.sqhk.co/pazakazagoz/jftgggi/kpop_news_twitter.pdfIn PDF document text
    • http://instapriz.website/166656762030ie87.pdfIn PDF document text
    • http://vududodudo.22web.org/gatutotubonatezujoxutoko.pdfIn PDF document text
    • http://gakmancreatures.ru/jekobawulejusaluselitobifj2xjl.pdfIn PDF document text
    • http://vasowenotaruso.22web.org/60010166626.pdfIn PDF document text
    • https://cdn.sqhk.co/muzorefu/gf3jfih/real_bike_cycle_racing_3d_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500438/normal_5fe622e13a373.pdfIn PDF document text
    • http://joy-todays.online/wanojoz6vdeh.pdfIn PDF document text
    • http://stav-games.ru/397382442854dhgy.pdfIn PDF document text
    • http://small-italy.space/40053418993ihiqu.pdfIn PDF document text
    • http://summ-ita.space/vefibevanukoda06hg8.pdfIn PDF document text
    • http://wigoduxaru.22web.org/facebook_dark_mode_apk_free.pdfIn PDF document text
    • http://virnet77.ru/fugosowevifolagede6hkwk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_6019120e84cc8.pdfIn PDF document text
    • http://autoport76.online/66273600529h8gwc.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/O9idtgg/last_cloudia_fairies.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tesoxukezeziles.epizy.com/symantec_dlp_14_admin_guide.pdfIn PDF document text
    • http://gefetela.epizy.com/gaxerelogipibewuzix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FB 5208 bytes
SHA-256: 80bf5485e115d58493b933016a50b9723cec16610f8a58db7373d37ff6ae448a
font_01_sfnt_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 9704 bytes
SHA-256: 5f002120bd49405a43ee425bf5a5edc3a9160eb7fbf2efdb18657ae6e359c2ff
font_02_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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