Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d4b7c375de20d9…

MALICIOUS

PDF

82.7 KB Created: 2021-01-01 09:58:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 90749a14b9a5db14f33342b193917db4 SHA-1: b78d458722cc5101ed0ae5b6bd343b42e0140116 SHA-256: c3d4b7c375de20d9a6b156aa1ff4f917225c354a7f4e1545b36ba1f275bc8434
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://traffine.ru/strik?utm_term=ice+scream+horror+neighborhood+game', suggests a lure related to a game, likely to trick users into visiting a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffine.ru/strik?utm_term=ice+scream+horror+neighborhood+game PDF link annotation
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/riwokezudenuxi.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/64ed39d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db27a81-3bb9-4b83-b9fe-34895dd75294/gta_5_apk_free_download_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/6446184843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/943604fc-bde1-4cf2-ab1d-3b02f7975817/german_swear_words_ww2.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/balika_vadhu_ki_ringtone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a5aec9-38fd-42f7-b4cc-2b29a9c41013/1982275629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7430dca-7bb9-42ad-9c57-9b4c69bb03a6/sinapago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b504e9c-9950-4c60-8de7-440a4ad34772/60632413076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/741a10d7-a1e1-46c3-8c18-ad33f230ad7d/nolarabo.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/27766767054.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 5396 bytes
SHA-256: cf0f08d59c8b4d75cda9ee8889faa326c54b9086c883d83a9f005097cd558abe
font_01_sfnt_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 7436 bytes
SHA-256: 0818d3c92e662ced9a49e7af0ed45267d0acf36fc0b97cb4bf0b776ab8edfecb
font_02_sfnt_off000100ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 10416 bytes
SHA-256: 4beab416309f0c0e89f464060d22bcb415ae821e5bb92d776668bff222bcf10a
font_03_sfnt_off000124d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D6 17348 bytes
SHA-256: 1ff905f0037b59a23c386e945f3625cf4e083cb391ba67f68d719fb12405819f

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