Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d878d1d22f1fdd…

MALICIOUS

PDF

69.7 KB Created: 2021-02-12 08:50:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 7c8d7fe81469fafa49cd5dc1bc2aecad SHA-1: 0919ed4cd8c03e254e728b495dca39aacff2093d SHA-256: 23d878d1d22f1fdd95f7e5814dacb1891587b025f35967a8c803373f403cc9e3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=2+examples+of+resonance+in+everyday+life PDF link annotation
    • https://ranatugirebulox.weebly.com/uploads/1/3/4/0/134017659/f460d5238fc7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468255/normal_5ff52c1ca68a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414868/normal_5fcdc96d9fb67.pdfIn PDF document text
    • https://cdn.sqhk.co/sebazisop/0giIndu/93580538987.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/pjjgfIb/the_secret_order_2_masked_intent_walkthrough.pdfIn PDF document text
    • https://jobadenel.weebly.com/uploads/1/3/1/1/131164033/e2732951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408174/normal_5fc82fcf1c6f5.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/hhvDg7a/marketplace_app_download_free.pdfIn PDF document text
    • https://bifugojatomawak.weebly.com/uploads/1/3/1/4/131437093/c704db45e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485821/normal_5fcaf9c2578eb.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/tumuzu/guidepost_books_series.pdfIn PDF document text
    • http://rijogutigoxek.epizy.com/77776838082.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/chibi_maker_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/the_bermuda_triangle_mystery_solved_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/arjun_patiala_full_movie_online.pdfIn PDF document text
    • http://luzadewo.epizy.com/43210571868.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_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 5568 bytes
SHA-256: 83ea6921a00d74cb001b29253ece8e0a574b1e08ed252875693279187d8651f8
font_01_sfnt_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 10628 bytes
SHA-256: 7a60af46d1350ea340d0d42c4f53c95071853a95c7004c2f0dabe6a2a0a8a61b

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