Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6fb45210c35ba7…

MALICIOUS

PDF

79.6 KB Created: 2021-04-12 22:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f193c7686ef22ef30db2bd422e585b8 SHA-1: 902cbbb55e18e59b39e7affce9da6c48b62a4a59 SHA-256: eb6fb45210c35ba7e27c124e2a511a515a177e97d4b526efb07b0eaf2379f0fd
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 pointing to PDF files hosted on file-sharing services, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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://jumiwimov.ru/strik?utm_term=reich+why+the+rich+are+getting+richer+summary
    • https://dunewalowipeli.weebly.com/uploads/1/3/1/8/131856746/6021234.pdf
    • https://fevukujiloz.weebly.com/uploads/1/3/4/7/134733145/pizadil.pdf
    • https://tixosame.weebly.com/uploads/1/3/4/5/134523113/801624.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/lebukigoroseb-tewupatajoso.pdf
    • https://wumaviki.weebly.com/uploads/1/3/0/8/130874148/1846903.pdf
    • https://sevebara.weebly.com/uploads/1/3/4/5/134501605/15d38ca8b73bc1e.pdf
    • https://cdn.sqhk.co/fuwufupi/OijhpQf/communism_and_capitalism_quizlet.pdf
    • https://xuposebifaperep.weebly.com/uploads/1/3/4/6/134673232/wupukozikizubi.pdf
    • http://goossyy.online/zonijeporifekerazekezipigvd9kb.pdf
    • https://cdn.sqhk.co/wemorapi/e2aIWm4/android_radio_nova_launcher_apk.pdf
    • http://nasty666.space/xefazazemutekosurupaselejy30u.pdf
    • http://studytogether.fun/44678509240dunf8.pdf
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/najabexomugi.pdf
    • https://kigefewapese.weebly.com/uploads/1/3/4/5/134528385/4998610.pdf
    • https://fowaloxew.weebly.com/uploads/1/3/4/8/134881160/zedaxobudopo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wazotojemov/bavimulesodewisuxurage.pdf
    • https://s3.amazonaws.com/lezopobigeza/shark_garment_stand_steamer_manual.pdf
    • https://s3.amazonaws.com/bulolimepol/symantec_dlp_15._1_system_maintenance_guide.pdf
    • https://s3.amazonaws.com/zafibimutadoti/18276610108.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_off0000f7ed.bin
88ab797826619e38f5e45b2721dec54eaca10d4ca023feb4a1ca0d6d14be078c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 5380 bytes
font_01_sfnt_off00010a33.bin
5fc6c9e74100ef05402d77d6845f0a31017e7407534c89e39679474bb2d4699b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A33 11200 bytes

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