Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59ecd7c0f1b8a78…

MALICIOUS

PDF

68.2 KB Created: 2020-11-14 22:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25684d8993a9961caa10b55c1a724c37 SHA-1: 699ba611f5c6b8b9a5bf5b95811195b78cd01b04 SHA-256: b59ecd7c0f1b8a78e572a930e8e39686fc1b8e53ab712be8973a310354de5669
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which are hosted on Weebly and appear to be part of a link farm designed to obscure malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan distribution attempt. The document body, though heavily corrupted, suggests a lure related to an audiobook, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=padre+rico+padre+pobre+audiolibro+completo+espa%25C3%25B1ol
    • https://renikafajuwigag.weebly.com/uploads/1/3/4/3/134317319/2897203c8c3.pdf
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/lemuwapijo_zomubujutir_jojepeti.pdf
    • https://tanezogifa.weebly.com/uploads/1/3/4/3/134321065/piput-desadibesofanav.pdf
    • https://tibanevugite.weebly.com/uploads/1/3/4/6/134655495/bezuberepifupe.pdf
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/nobudogijimuwon-xifide-perapumaz.pdf
    • https://daxuregivav.weebly.com/uploads/1/3/4/4/134431970/5796043.pdf
    • https://lekinowi.weebly.com/uploads/1/3/4/4/134476644/1727930.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jinabom/bewawosawol.pdf
    • https://s3.amazonaws.com/memul/nightwatch_astronomy_book.pdf
    • https://s3.amazonaws.com/jukezeluf/magna_carta_game_pc.pdf
    • https://s3.amazonaws.com/fovezewi/13864815149.pdf
    • https://s3.amazonaws.com/xozeb/dav_pilkey_sayuri.pdf
    • https://s3.amazonaws.com/tiduro/hindu_calendar_2018_with_holidays.pdf
    • https://s3.amazonaws.com/suzixegazunow/bhartiya_samvidhan_notes_in_hindi_download.pdf
    • https://s3.amazonaws.com/tokafanawa/78447197760.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be57.bin
c5fa3efbfa3436cddeae693cdbc988a647fb66e050abe39202dd716966f64e56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE57 5572 bytes
font_01_sfnt_off0000d0de.bin
f23b418b2a34a2400d80e995ab779c6f7e23a2f60aa5d91c3425da69a22d2a95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 2700 bytes
font_02_sfnt_off0000dc60.bin
0875b7895b2ad7730316218ba9ceb5210a490ad59357f06321e3847473293d19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 11172 bytes

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