Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4f156100277e25…

MALICIOUS

PDF

76.0 KB Created: 2021-04-12 13:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 881d8a863109d011afd0de78c33e004a SHA-1: 6220b8adc65e326e0c67e4b3d708ba4ad138ed51 SHA-256: ae4f156100277e2512a56bf1d0750cbef6447f7aece6e9e4e36409a67db5a38b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=how+to+be+a+therapeutic+foster+parent
    • https://static.s123-cdn-static.com/uploads/4506131/normal_5fee3d144bc61.pdf
    • https://cdn-cms.f-static.net/uploads/4463277/normal_603138467a843.pdf
    • https://cdn.sqhk.co/zupitefa/8baLiiB/smart_balance_wheel_hoverboard_reviews.pdf
    • http://copyright-services-us.com/27516588295uallv.pdf
    • http://visiblawty.com/vubitudisegarufo3rqg.pdf
    • https://cdn-cms.f-static.net/uploads/4366668/normal_601115cd67c11.pdf
    • http://feludekinopotas.scienceontheweb.net/34646654215.pdf
    • http://7evenrp.ru/turabian_chicago_style_in_text_citationszf2ss.pdf
    • https://cdn.sqhk.co/jowapezo/Shdhjhc/kukavonagiwerupafu.pdf
    • http://richteam.site/joxaxuvisudoje6ydt4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nodetuxapabara/can_i_connect_wireless_subwoofer_to_receiver.pdf
    • https://s3.amazonaws.com/fopalew/twitter_hd_video_er_app.pdf
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_63e2c5dbe8c44910ba46266e1e173e76.pdf?index=true
    • http://gototura.myartsonline.com/haircut_locations_open_near_me.pdf
    • http://jelenaw.myartsonline.com/sifejip.pdf
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_a0c8006c3c3e46149602f3724da55f2d.pdf?index=true
    • https://s3.amazonaws.com/jevopemosod/delta_scroll_saw_40-560c.pdf
    • https://s3.amazonaws.com/boduxatavepe/cracking_down_on_digital_piracy_report.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_off0000ebf5.bin
99a62225c01dda12e98f3753a4f1dd2bfcd7494c582672c59437073e69607054		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 5264 bytes
font_01_sfnt_off0000fde6.bin
adb2b14d9be856ab74f7467a05d79e0ba26d2eca845c40451d36ae3b7dddf8ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 10892 bytes

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