Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a5908c1582a84f…

MALICIOUS

PDF

85.0 KB Created: 2021-04-29 00:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28089ffede8ba76e87bd66621cd2df03 SHA-1: 27c3a4147846acf4b3ae97b00fde2023fd3466fc SHA-256: 56a5908c1582a84f83239174ff4af0544ac04384b699df7822434e9be9df55ea
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. This suggests the primary purpose is to direct users to a multitude of other PDF documents, potentially for SEO manipulation or to host further malicious content. No scripts were extracted, but the presence of numerous external URLs is a strong indicator of a malicious campaign.

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://jacksth.ru/strik?utm_term=ap+lang+rhetorical+analysis+essay+practice
    • https://cdn.sqhk.co/vefomatakin/7iclgel/dream_daddy_characters_craig.pdf
    • https://cdn-cms.f-static.net/uploads/4420018/normal_6012914d22325.pdf
    • https://cdn.sqhk.co/samofetob/dhdjjie/do_crows_eat_eggs.pdf
    • https://cdn-cms.f-static.net/uploads/4471109/normal_60606a2010990.pdf
    • https://cdn.sqhk.co/sativomofij/8d5jcge/derasoxapepirowavej.pdf
    • https://cdn.sqhk.co/gebunemif/y7TrihI/mojoselasomumumisegot.pdf
    • https://static.s123-cdn-static.com/uploads/4370525/normal_5fe2097ea47bd.pdf
    • https://cdn.sqhk.co/dulinifijal/ibiiKge/free_challan_no_280_excel_format.pdf
    • https://static.s123-cdn-static.com/uploads/4420905/normal_5ff6769d3da7c.pdf
    • https://cdn.sqhk.co/waxuniwite/gOk7jEy/36340133067.pdf
    • https://cdn-cms.f-static.net/uploads/4370268/normal_6012348b8c8bf.pdf
    • https://cdn.sqhk.co/wirowanorax/SigLm3W/wokamegepubanepidulejawa.pdf
    • https://static.s123-cdn-static.com/uploads/4421780/normal_5fcae897747ba.pdf
    • https://cdn.sqhk.co/bisidilit/fbijjdc/speedy_heron_road.pdf
    • https://cdn.sqhk.co/zofizitene/U1njed0/adelantado_trilogy_book_3_free_download.pdf
    • https://cdn.sqhk.co/parikozug/ihifFJN/15540493802.pdf
    • https://cdn-cms.f-static.net/uploads/4374978/normal_5fd2c0c9bba5c.pdf
    • https://cdn-cms.f-static.net/uploads/4485828/normal_5fd64b992fdfd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_bf0fda3321284444a66aef83be726f49.pdf?index=true
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_3bc69f918f5949628d4bdb01afa1f0f4.pdf?index=true
    • 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_off00010e28.bin
c84e22e5af2c8d4fc7994a91359289e07364c75a964b9a778fe307945a3a93bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 5284 bytes
font_01_sfnt_off0001202b.bin
fd96bc3816028a3fd34ad0b42bd8a2149c27e07119843b69174c10b6e496997e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1202B 10792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.