Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b473002fa50369…

MALICIOUS

PDF

97.3 KB Created: 2021-02-24 22:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1a6cf36381b6022bb7a903c6ad3a4f86 SHA-1: fa2501652da951fc7bec5f648e4430e0bd75ab26 SHA-256: 17b473002fa5036908ec7df2d70e168bb164c716f4c917951beccc07a29e9f9b
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to educational worksheets. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of many embedded URLs points to a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 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.
  • 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://crophysi.ru/wix?keyword=math+dilation+worksheet In PDF document text
    • https://cdn.sqhk.co/jagibuvat/jg7jgVa/57453267014.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/RQtihhg/musinigamosevid.pdfIn PDF document text
    • https://cdn.sqhk.co/sisagoku/dsN6ifq/32877779006.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/PgfgerK/17803513703.pdfIn PDF document text
    • https://cdn.sqhk.co/vameduvide/hhp2hb4/famivakupesedemogi.pdfIn PDF document text
    • https://cdn.sqhk.co/retepisej/iemjO6G/new_car_sales_manager_jobs_near_me.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/97490499446.pdfIn PDF document text
    • https://cdn.sqhk.co/jedugifaxido/iOjdiav/motulitokokipitewiwego.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/djciB1f/15821791694.pdfIn PDF document text
    • https://junuwuka.weebly.com/uploads/1/3/4/4/134479395/8762017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_6033d1c36e833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462708/normal_60322abc8ce16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459028/normal_5fdff43dcef23.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/wutisigila/bajrang_dal_hd_image.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/telling_time_clock_worksheets_spanish.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00011b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B15 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off00012b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B09 5076 bytes
SHA-256: f7f7f66faa27aa2089a11c4ce5ebb710703836a4fe2bb71d72a4d4046c92ef6d
font_02_sfnt_off00013c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5D 11164 bytes
SHA-256: a37937a5d1e2d488062e0b7b159feb674c4147d166e10b2037a985d5fff15850
font_03_sfnt_off00016278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16278 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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