Malicious PDF — malware analysis report

Static analysis result for SHA-256 504a1523474c40c3…

MALICIOUS

PDF

71.4 KB Created: 2021-02-24 13:30:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6303136cda95a76cea4427868fe93c71 SHA-1: 78e190a84c729e694aa4786a7410cc4ea440a911 SHA-256: 504a1523474c40c3ccdb5b61f9b2f127d22671be1f50e2d0e867bdc35546d4a9
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' designed to distribute other PDFs. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent to redirect users to potentially harmful content. While no scripts were directly extracted, the structure and heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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
  • 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://baarspo.ru/strik?utm_term=dsc+1832+trouble+code+5 PDF link annotation
    • https://cdn.sqhk.co/simikimira/eihCjdu/19713307692.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/2MijjjA/wagebinufisumefovepem.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/Mhejeje/90062365503.pdfIn PDF document text
    • https://cdn.sqhk.co/sizebadit/Gghnwho/18340899733.pdfIn PDF document text
    • https://funiwulew.weebly.com/uploads/1/3/2/8/132814073/1069773.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/hjhePPs/36386645896.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/iedjh5u/98044293733.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/fijdnjh/url_video_player_apk_ad_free.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/1vuTqjb/tugamamadanuvutu.pdfIn PDF document text
    • https://napolapivu.weebly.com/uploads/1/3/5/3/135303388/dorefujebapojax.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/radkhhd/50441883623.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://puligop.epizy.com/anjali_anjali_song_ringtone.pdfIn PDF document text
    • http://mikozigejeti.rf.gd/how_to_make_reaction_paper_format.pdfIn PDF document text
    • http://disobaratid.rf.gd/drinks_menu_template.pdfIn PDF document text
    • http://wupuwijekoja.rf.gd/naxakujeramovabip.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_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 5256 bytes
SHA-256: 2e8f02391d56c9ba1ddda38ee3434966f0cc3f774d922480dd4193fd307fcf93
font_01_sfnt_off0000de29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE29 10664 bytes
SHA-256: f0e61679b59756f689ccba51e43a787098769437387543d83ca3f9f5257ff74e
font_02_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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