Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca115dd9bed3b1a…

MALICIOUS

PDF

101.2 KB Created: 2021-03-24 19:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b1dc3b67ccc30a3c84df3c0a0405436a SHA-1: d980b1b3d96a77c1e3e99968a5df868afd213747 SHA-256: bca115dd9bed3b1a48ebac28731f8e9107b70fe81876f54e06de0bcd203b070a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to potentially disposable hosting. The embedded document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and date/time information, suggesting it was generated programmatically. The presence of multiple external URLs, including one with a UTM term redirector, strongly suggests a phishing or malware distribution attempt.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/123?utm_term=format+coordonn%25C3%25A9es+gps+utm PDF link annotation
    • https://cdn.sqhk.co/geruxibab/Yhhbhap/kroll_s_booyah_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/donaxewon/dVibkii/12810433711.pdfIn PDF document text
    • http://vugijow.iblogger.org/21881422385.pdfIn PDF document text
    • http://domotoj.sportsontheweb.net/livre_ahlam_mosteghanemi.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/ie59Cic/wexudoso.pdfIn PDF document text
    • http://vakiduweg.mygamesonline.org/38232032684.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/jamW9V8/lefisuporijedegovedomux.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/P0gc8gf/epson_iprint___windows_10.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/how_to_fix_water_leak_in_kenmore_refrigerator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jafuzoteneg.epizy.com/what_oil_does_2015_chevy_malibu_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c4426bd-4875-4824-af85-1e5e89babdec/sorelugumagefinoxepasiw.pdfIn PDF document text
    • http://tadiwolavis.epizy.com/concept_map_template.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/kevabidukaludagotula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5a77538-ab66-45b4-8f3f-2463b1b3e564/journeys_practice_book_grade_4_spelling_words.pdfIn PDF document text
    • http://movozenumoz.epizy.com/puzazetakunarukabezuda.pdfIn PDF document text
    • http://togipumenotu.epizy.com/levenuvunatazurabujaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eca6800-4631-4f1e-a358-5228c02e7590/75306790851.pdfIn PDF document text
    • http://rupatuzibe.epizy.com/the_warded_man_audiobook.pdfIn PDF document text
    • http://fofuxolisemaxim.epizy.com/id_card_design_template_excel.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_off00012cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDF 5456 bytes
SHA-256: e16b63e4764e811e3e703272ea4cf989a7fce23c1c7b730b04f24f882a87e431
font_01_sfnt_off00013f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F12 15404 bytes
SHA-256: 304e85838422eee9da1b79d4104c04c70d8a9f8849c2e32cca866df7d3d33fd6
font_02_sfnt_off0001705e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1705E 16156 bytes
SHA-256: ba929843ac510417f7ea76cc397a7d7f4e8f6595560374715afbfbed92c09c17

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