Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e0da663b800e1d…

MALICIOUS

PDF

77.3 KB Created: 2021-04-09 01:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08d8081f7f9c6945edd9c3f8b76fbd4b SHA-1: 52cda78253922d8f2f663563fe75985548593d0e SHA-256: 75e0da663b800e1d2300d74ab3c64d6973032799f504e27c4e7c8e2fe1737db5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to create a link farm. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=does+samsung+make+a+universal+remote
    • https://cdn.sqhk.co/dugelabomaw/9cGSEgc/super_soccer_champs_2020_hack_apk.pdf
    • https://cdn.sqhk.co/wixikinotu/a7tdhff/kutexo.pdf
    • https://cdn.sqhk.co/lazimafuxuxi/WgfiPjh/74335586607.pdf
    • https://cdn.sqhk.co/matelasoguje/ehdM0ji/20747552804.pdf
    • https://cdn.sqhk.co/zezinojox/giiacib/disevegataxen.pdf
    • https://cdn.sqhk.co/zelosoza/agjjigi/zombie_apocalypse_gun_games.pdf
    • https://cdn.sqhk.co/dakubakasilu/if3RDgd/atlas_obscura_guide_to_los_angeles.pdf
    • http://fiziwafofekaku.mygamesonline.org/arpack_tedavisi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gemovimuwopete.atwebpages.com/wuwafajo.pdf
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_7337361a755642afa906e798f5264d44.pdf?index=true
    • https://s3.amazonaws.com/warapagefasovi/84138601633.pdf
    • http://wilosokanik.myartsonline.com/cours_d_ergonomie.pdf
    • http://vekabun.myartsonline.com/43356376099.pdf
    • https://uploads.strikinglycdn.com/files/944b276a-b9b0-4d68-b34d-16fe98f35c97/tejexajosezumemikaxapiva.pdf
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_387d96111df842e7b2ffc5ad03aad8d5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2492225f-4baf-4874-aad9-502ab96e7313/95735692236.pdf
    • https://s3.amazonaws.com/povelenavuviw/emily_dickinson_poems_unrequited_love.pdf
    • https://9177b9cb-4c70-42bd-a9e0-27a1bf53b67b.filesusr.com/ugd/9baf76_8cd5ed8054764f60ad5ed2b46fcd47b5.pdf?index=true
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_0cdc61cf70154a84873af5d4d3066dc9.pdf?index=true
    • https://efec373b-cb85-4617-95c0-ca1809d574ea.filesusr.com/ugd/9529b1_86547273057d4443b2bb7c2cff8668a5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e564.bin
710555385063cfab9b41dfc89e5afa272ff4e842e65e963cfb3bd857a647a84c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 5008 bytes
font_01_sfnt_off0000f65f.bin
879f8c0d1efe65c1404a5c1f4fcb469790ecc5fb744db0c8a89bd004ae30db0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 10328 bytes
font_02_sfnt_off000119cb.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 4324 bytes

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