Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c773adc1a23e03f…

MALICIOUS

PDF

119.1 KB Created: 2021-01-04 02:13:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4f7515260ce9bdea7223a9b6dd323b0a SHA-1: 7f3fc39c0427561aa58128ac4ec0dfd19df4182e SHA-256: 6c773adc1a23e03f3f819923b8867822eaed4994531917b243aa58d8e114dd61
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with heuristics indicating a link farm and a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/aws?utm_term=bimanual+uterine+compression+massage In PDF document text
    • https://miwevedadig.weebly.com/uploads/1/3/1/4/131437981/d0a7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_5fd355e766d34.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/d1327221-34ae-4d5e-93e3-4580c66bfe91/clash_royale_hack_apk_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f90e7e6-2ab6-4837-9cba-6838c7baf647/xefigiwaf.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/gold_brick_guide_lego_marvel_superheroes.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/86456810065.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/gerumutifeturakevebafabek.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/lagu_kartonyono_medot_janji_ska_version.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/sociology_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/precalculus_binomial_theorem_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a40ecba-40c3-4382-92b0-37a67d28a2c1/colorado_school_of_mines_course_catalog.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/kekoriduwagavofawobek.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/50493572627.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EA1 5304 bytes
SHA-256: 82e73bd4cdad19c60e07034e08bf4db57416fe93c1fd0f13da8094824a4b822a
font_01_sfnt_off0001908c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1908C 12108 bytes
SHA-256: bb275ecb25f800e449cc8d1474a9495ecb5f66188e23639d2e6a4ea2dff4bc49
font_02_sfnt_off0001b998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B998 16080 bytes
SHA-256: a78d54aecbf58bf6bac5dc94ec7e96a77e86e9bbd7e5b0032a250a32128a2ff5

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