Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8f2787283b1cbf…

MALICIOUS

PDF

82.4 KB Created: 2020-12-27 00:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 46e9e31e78d3b865c75d9fbbbc6a2ac7 SHA-1: 876ba43ed489968045b82c8ff7de88b187240071 SHA-256: dd8f2787283b1cbfc2ec5c63b8324a70f8a4d32faf2fb2c7c04c12ba588e7934
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating a link farm and external URI usage. The document body, though heavily obfuscated, contains text suggesting a lure related to a book title. The presence of numerous external links, including one to 'trafffi.ru', indicates a potential phishing or redirection attempt, possibly involving the execution of embedded JavaScript.

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
  • 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://trafffi.ru/123?utm_term=the+corrections+jonathan+franzen+pdf PDF link annotation
    • https://kitarenabokuvum.weebly.com/uploads/1/3/4/4/134479912/siworofajaguzigonexo.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/a296f6cc-d6cf-4270-8a85-da0e1a050f9d/accounting_principles_volume_1_7th_canadian_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/back_button_onclicklistener_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/characteristics_of_living_and_nonliving_things.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/danny_boy_sheet_music_voice.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/lesson_planet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/karofafapixemakisek.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/mevabapugisel.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/best_english_spelling_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33b2163-6b62-4bcd-9050-1b5e91e13e0a/sueo_de_una_noche_de_verano_analisis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63022f9f-5643-4f86-8317-012c9fa8f281/tixawaguvinapemuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4156dfd3-df79-495a-8d6a-5f27e4c5d8f6/st_ansgar_schools_ia.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/brother_dcp-_t310_specification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69114710-4827-4301-abb7-843e0fe6b4bd/6521384310.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_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 5288 bytes
SHA-256: 2feb978c8a057342a46c20c06b28ce0ed6b1c1d34571d347e9766ae16a3f2a45
font_01_sfnt_off00011897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11897 10648 bytes
SHA-256: b9547490efbe92c6fd9f6a1f61cff98870bed2583610306e4358828e5ed5ca3d

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