Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e788db20346df95…

MALICIOUS

PDF

78.7 KB Created: 2021-03-15 21:37:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c945697c67aafdac360158483f566a5 SHA-1: e85544c46309187530da89c89d58f4c8a9b53f84 SHA-256: 2e788db20346df954408f934d0cb17ef44ef70a8d56e8ccb872289d4cfa071e7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files on various domains, indicating a link farm or phishing infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for redirection.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/aws?utm_term=how+to+adjust+g+shock+time+5522
    • http://erse.xyz/best_text_to_speech_voice_for_androidla4kv.pdf
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/nodukikatemaku.pdf
    • http://surulefej.iblogger.org/83684826924.pdf
    • http://erkutungotu.com/roblox_toys_amazon_prime5prv5.pdf
    • http://zifasito.22web.org/kanchana_3_movie_tamil_free.pdf
    • https://lexugorubu.weebly.com/uploads/1/3/0/7/130776619/mutenenen-mavipud-rikil.pdf
    • http://table-wait.com/1352700366b02cu.pdf
    • https://tedotedonux.weebly.com/uploads/1/3/0/7/130775879/6470578.pdf
    • http://copyrightreports.com/kuwifiwisolejovoxo2szrf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/silubebebefuju/95565124751.pdf
    • https://s3.amazonaws.com/kofabube/edital_policia_rodoviaria_federal_2018.pdf
    • https://s3.amazonaws.com/tugafebip/intervening_prepositional_phrases_worksheet_answers.pdf
    • http://nupejodolet.epizy.com/fast_auto_tap_android_app.pdf
    • http://jivikone.epizy.com/oster_10_cup_food_processor_replacement_parts.pdf
    • http://zegaruso.rf.gd/guwuput.pdf
    • https://s3.amazonaws.com/bisiku/ultimate_mma_strength_and_conditioning_training_guide.pdf
    • https://s3.amazonaws.com/simujix/wotor.pdf
    • https://s3.amazonaws.com/rezugekolaba/73625432516.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd1b.bin
c9433bbf4bd711723cf19a8b7ed2e6b43b9a98ddfd2fe9579d9b376bbad72537		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 5676 bytes
font_01_sfnt_off0000f065.bin
bc69297306e34c040bd1230b120a6c941d7edf49e7324d2189cf00de4e4cbd43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 11020 bytes
font_02_sfnt_off00011671.bin
536551dee6876366cf8a5d925709f0aaa9c9f58e9963f4e154d0e8cf77de6ee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 16196 bytes

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