Malicious PDF — malware analysis report

Static analysis result for SHA-256 955db63ba9c43c4b…

MALICIOUS

PDF

84.4 KB Created: 2021-03-14 22:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 01febabd6567519d6245639e75e0c9d9 SHA-1: dba58068ff94db8f6fdcfd87be2f18818108b0ce SHA-256: 955db63ba9c43c4b7f637de9708ab356593d59a52749db34d5019da27e45db34
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded links to various domains, many of which are disposable or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/wix?keyword=ratios+and+proportional+relationships+7th+grade+worksheets+answers PDF link annotation
    • https://cdn.sqhk.co/kogewole/ghfhf6u/happier_music_video_10_hours.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421782/normal_5feb83d74422d.pdfIn PDF document text
    • http://rgtuitp.ru/is_there_a_free_keto_meal_plan0twvh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_604dc73915275.pdfIn PDF document text
    • http://operationhomeplate.com/dufuwemirurudofatirelopalfub3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481522/normal_602832b9ed8bf.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/626ieCo/71980690106.pdfIn PDF document text
    • http://igonlinesupport.com/funivumugewafowed08.pdfIn PDF document text
    • http://cosmicgig.com/32878949569381q5.pdfIn PDF document text
    • http://winsbig.space/best_bodyweight_exercise_app_android35fut.pdfIn PDF document text
    • http://bluebadgeapproval.com/85377825891ihs6n.pdfIn PDF document text
    • http://hopecommunitynaz.com/anatomy_for_sculptors_reddit1c9gz.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/jlLDEhd/gta_san_andreas_gang_territory_glitch_xbox_360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_601f89f8a9594.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_f02e4cb721384772a4bbf9cda35383ae.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_d2920d1a7b8d4f7fabbbd03a802bc246.pdf?index=trueIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_909406a26b604b5fb747895a358273ab.pdf?index=trueIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_ee59580430514a738917462eb002ec29.pdf?index=trueIn PDF document text
    • http://pesetunal.onlinewebshop.net/55852086284.pdfIn PDF document text
    • http://xujided.onlinewebshop.net/jazupibafadidetovolawumuw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 5252 bytes
SHA-256: a4ed010f6b9ae6bd7ef8d0e40b4f59e68995e25b8f4f1489ad4d76616d55d60d
font_01_sfnt_off00010fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 10992 bytes
SHA-256: 499352f4da782d93a3d902cb1854cd4b4f3372d8024c3c106f4d20ef66e237f5
font_02_sfnt_off00013578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13578 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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