Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd6cb1bf6923dd9…

MALICIOUS

PDF

121.2 KB Created: 2021-03-22 12:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4633a62cb1b0a53fb650e3d00f12047a SHA-1: bf03fc04638734679738693c444d73c9b37df96d SHA-256: 7fd6cb1bf6923dd9aa01314005fd6acd742c59e72939f625c13848e95534b860
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, indicating a link farm or distribution mechanism. The heuristic PDF_SEO_LINK_FARM specifically flags this behavior. The embedded URL in the document body, while obfuscated, suggests a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://resalured.ru/aws?utm_term=transformations+of+quadratic+functions+quizlet
    • https://cdn.sqhk.co/lobinazema/NiaqPhh/armello_android_gameplay.pdf
    • https://xatuzagu.weebly.com/uploads/1/3/0/7/130738971/6812750.pdf
    • https://cdn-cms.f-static.net/uploads/4368763/normal_604d04c85dbad.pdf
    • https://cdn.sqhk.co/boguzivipel/BLFhjyW/best_apps_for_editing_tik_tok_videos.pdf
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/8059908.pdf
    • https://cdn-cms.f-static.net/uploads/4450338/normal_6021404f00677.pdf
    • https://cdn-cms.f-static.net/uploads/4453563/normal_5fd2ed9874691.pdf
    • https://static.s123-cdn-static.com/uploads/4424330/normal_5fe1894cab0da.pdf
    • https://cdn.sqhk.co/gikunixa/hGjdIgh/faith_family_academy_waxahachie.pdf
    • https://belijexulifowa.weebly.com/uploads/1/3/0/7/130738738/rokopizukafagukuxera.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/genukopapovixo/adobe_cloud_error.pdf
    • http://vejaxuka.epizy.com/agent_vinod_full_movie_watch_online.pdf
    • https://s3.amazonaws.com/mogedozara/fagakavedetolizelasobe.pdf
    • https://s3.amazonaws.com/wovugi/ipega_9157_bluetooth_gamepad_ios_android.pdf
    • https://s3.amazonaws.com/kalanejaxutilif/98592995566.pdf
    • https://s3.amazonaws.com/sowewazulejewi/27160220631.pdf
    • https://s3.amazonaws.com/bolovopizonuki/angular_4_simple_form_example.pdf
    • https://s3.amazonaws.com/pegozegi/pevivalemadilejipamoriv.pdf
    • http://goviragukipi.epizy.com/96563766457.pdf
    • https://s3.amazonaws.com/vokeri/incubus_best_songs.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/gipokegi.pdf
    • https://s3.amazonaws.com/nitidadufetenu/gawot.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016737.bin
929231f2a437b95bf9e1b211164dc51f829b14dbf85359fce2225ce8947b9776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16737 5172 bytes
font_01_sfnt_off000178a1.bin
0a36955d396681ffc7e074718ca4fa0455736b59d134c8f41683ae0afed3e613		 pdf-font-stream PDF embedded font (sfnt) at offset 0x178A1 2776 bytes
font_02_sfnt_off00018473.bin
2efa3ff3d313055df14c6cd77ee22680e1153eb46bf69a886a76e47722353e78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18473 13716 bytes
font_03_sfnt_off0001b2c2.bin
9def142226f437a2ba4283d976d890154c0e2dbb92bc97532184205699c6e9c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2C2 16148 bytes
font_04_sfnt_off0001c7cd.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7CD 4324 bytes

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