Malicious PDF — malware analysis report

Static analysis result for SHA-256 248d8f64db2c2404…

MALICIOUS

PDF

68.6 KB Created: 2021-06-10 02:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4963ccf0b61848d1cda6264b197c569b SHA-1: 80bf7c7d007ddbd297993e1254164a125330d988 SHA-256: 248d8f64db2c2404ddc153d45a1b7b842df4504c9f6774c7dc84ca6e7737a7b8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting it's part of a link farm designed to redirect users to potentially malicious content. The primary malicious URL identified is https://coretry.ru/pbw?utm_term=skinny+love+piano+pdf, which is likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/pbw?utm_term=skinny+love+piano+pdf
    • https://lapifebe.weebly.com/uploads/1/3/2/6/132695874/424675ae497.pdf
    • https://gosizunasinati.weebly.com/uploads/1/3/0/7/130739879/9192312.pdf
    • https://rimidewazasi.weebly.com/uploads/1/3/4/3/134317879/gifiwinoxetawag.pdf
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/5189774.pdf
    • https://kixasakuzejud.weebly.com/uploads/1/3/5/3/135347884/vipugubavaz.pdf
    • https://pezasagizagifoj.weebly.com/uploads/1/3/5/9/135968908/4564906.pdf
    • https://tirokaroxere.weebly.com/uploads/1/3/2/7/132740449/juranemokefinozovubu.pdf
    • https://fitarerak.weebly.com/uploads/1/3/5/3/135313257/22398e.pdf
    • https://suxokigivulumu.weebly.com/uploads/1/3/4/4/134479742/junap-fezugadixa-todagezadut-xofumaloviba.pdf
    • https://tatagufok.weebly.com/uploads/1/3/4/6/134692967/6877625.pdf
    • https://gumopokexu.weebly.com/uploads/1/3/0/8/130814161/05a968.pdf
    • https://vilawamilufulob.weebly.com/uploads/1/3/6/0/136006615/64c7ae30a.pdf
    • https://vokijovagugudis.weebly.com/uploads/1/3/0/7/130776016/dituve_zitaboxuvo_wifamiteviva_pekedabulaxax.pdf
    • https://faxovidovatage.weebly.com/uploads/1/3/4/3/134378957/mawemedosufi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/099d2ba9-aa46-48e3-b7b5-86f5ec239ec2/fce_practice_test_plus_2015.pdf
    • https://uploads.strikinglycdn.com/files/5c64f59e-3c8f-4130-8a18-81ce6b3894eb/sefirurudepitadotulup.pdf
    • http://gatunam.pbworks.com/w/file/fetch/144680946/34835659189.pdf
    • https://uploads.strikinglycdn.com/files/c716a258-e2ba-4ae9-8cb4-f9447dd68197/bumunimovufazabib.pdf
    • https://uploads.strikinglycdn.com/files/943570a3-fc89-45de-9fd9-416cf10ee165/67780605084.pdf
    • http://pagorevet.pbworks.com/w/file/fetch/144472455/how_to_check_lmia_fake_or_real.pdf
    • https://uploads.strikinglycdn.com/files/a38c54b8-855a-41ad-a8bd-55e8c1ef01be/how_do_you_write_a_one_page_synopsis.pdf
    • http://jitilabajeko.pbworks.com/f/17625158273.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce0a.bin
2557f67838b884a26c31110139c20f3f287f14e0a8ac2f867c2576a88ff9ccec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0A 5092 bytes
font_01_sfnt_off0000df8b.bin
048e04271121d4565c8b7dffba9343db9d0cfe507c9bc2486dba7a22f0f2b768		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 10444 bytes

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