Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3701ebe7bef9d2…

MALICIOUS

PDF

121.6 KB Created: 2021-01-06 07:28:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3e23cfc36f08ba8e75356d20e577a362 SHA-1: d3bce46c297b5a0365160ce9de4e26f4506f6ab6 SHA-256: da3701ebe7bef9d2ffe629aa16094010a3609819dbd96d60cc809084d3ebf2c0
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains or are part of a link farm, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/123?utm_term=neil+degrasse+tyson+pdf+book In PDF document text
    • https://lujinelux.weebly.com/uploads/1/3/4/3/134361227/4357355.pdfIn PDF document text
    • https://vapufubewadul.weebly.com/uploads/1/3/4/4/134485241/zupubup.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/6385668.pdfIn PDF document text
    • https://tabefelob.weebly.com/uploads/1/3/4/3/134372343/wugeji.pdfIn PDF document text
    • https://cdn.sqhk.co/miwiwefe/iaggifU/nusewaxeturusodenotaro.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/mudurixo/cuckoo_bird_sound_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/rizudawuke.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/gudodomimukidodanazid.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/eureka_math_lesson_13_answers_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/pdf_editor_combine_pages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd0ae88-b1cf-40a9-8983-0e924e90413f/64902438256.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_off00019184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19184 3076 bytes
SHA-256: e4f641a6971d291a367078cc17becefac5cd32d03b6d707e84ae8ffd8c02b8ee
font_01_sfnt_off00019c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C78 5484 bytes
SHA-256: f38235b4a08bc869f94c59fa2576ade9450470a7fafcc6b2c69ef3e4d5e91926
font_02_sfnt_off0001af3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF3A 13100 bytes
SHA-256: 855e35309eec3fdca7e051b88aee0edc1888b5401119188e9fc62f20e1fc976b

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