Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00524ece0aea0b4…

MALICIOUS

PDF

81.2 KB Created: 2021-01-21 17:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b83adf888556c7de548da6824122b0ba SHA-1: 46fa51951b5f8857536bc2205b1f516889302c41 SHA-256: a00524ece0aea0b4cf27f30c037b3ff1843fb3cf553a500638d50b636716e75b
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme.

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 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.
  • 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://jottigo.ru/123?utm_term=jfk+middle+school+northampton+ma PDF link annotation
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/rigevibevenirod.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluniziwav/jjcywgh/harpoon_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/dadakafopina/R0K9Zb5/monstera_plant_leaf_brown.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/piduxu.pdfIn PDF document text
    • https://vunakeba.weebly.com/uploads/1/3/4/6/134623580/9654928.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/iibgiig/11849524186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_5fd8988a398c8.pdfIn PDF document text
    • https://site-1172364.mozfiles.com/files/1172364/jakapitawosepirawozawat.pdfIn PDF document text
    • https://site-1178487.mozfiles.com/files/1178487/skylands_stadium_nj_halloween.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/Vghhjjc/76423819656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_5f96727ab7397.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/farezelof/android_samsung_tv_mirroring.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/tiny_dancer_elton_john_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/zowojufosot.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/sosexi.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/don_williams_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/mefuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/heise_notepad_portable.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_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 5448 bytes
SHA-256: 95c899d2efbe390dc9eaa2e4da89b19d032059df9191e91901f57667b03ce349
font_01_sfnt_off000111fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FE 10920 bytes
SHA-256: 105bca8df7014fe97d2b4c27f8fe93fb95e2384f05f3393f303da1160831770a

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