Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00306aff5a859f1…

MALICIOUS

PDF

70.9 KB Created: 2021-02-15 03:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 667a12a626653d75f5376b3636ccbd1c SHA-1: b4df787684e153b413fa9ba7f7af19accb43b694 SHA-256: f00306aff5a859f174e43bff23f88a5a95f588e43a01e850377478536cc47457
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and heuristics indicate it is a malicious redirector and link farm, likely designed to trick users into downloading files. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the 'download button' heuristic point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wix?keyword=project+64+apk+para+pc In PDF document text
    • https://cdn.sqhk.co/kugefiruxat/bwghYjg/tugezewigo.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/ZjaSYhc/steel_ball_run_39.pdfIn PDF document text
    • https://cdn.sqhk.co/zivunegas/rYijuNQ/kadewegigutolef.pdfIn PDF document text
    • http://meletemobu.iblogger.org/aankhen_teri_kitni_hasi_video.pdfIn PDF document text
    • http://fruittea.space/vofibede8hsgq.pdfIn PDF document text
    • http://hookup157.online/74872804572sp0rk.pdfIn PDF document text
    • http://malurafokopumer.22web.org/30314627705.pdfIn PDF document text
    • http://medtechnika1.ru/zeoworks_slendytubbies_3_update71cnt.pdfIn PDF document text
    • http://tk-time.site/naxexedaxitatakizurareduvolh23.pdfIn PDF document text
    • http://sun-italy.space/coming_home_song_mr_jatthre78.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tadabafilebe.epizy.com/sikepadokovidapirelem.pdfIn PDF document text
    • http://ramapenutizawa.epizy.com/bollywood_movies_in_mp4_free.pdfIn PDF document text
    • http://biledimetiwen.epizy.com/vikedasapi.pdfIn PDF document text
    • http://nuxewetim.rf.gd/11355405928.pdfIn PDF document text
    • http://koburolamugalo.rf.gd/jivamenazevuputefekixunot.pdfIn PDF document text
    • http://sezajuvijib.rf.gd/chuck_season_3_episode_1_free.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_off0000da22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 5100 bytes
SHA-256: d5c172e7d093bd8d73407e6a8e1aed1419ac2b8c01c9b7d02f3d59e71e49c34a
font_01_sfnt_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 10476 bytes
SHA-256: b35a09939e2b599c5e11062553d43bfae79ea7bff8aac5548e5b9d6a03389b4c

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