Malicious PDF — malware analysis report

Static analysis result for SHA-256 d756c22b60f4937b…

MALICIOUS

PDF

72.7 KB Created: 2021-03-17 23:01:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: be5de89d0b2f2f5ad1ee87206f054bdf SHA-1: 1d0a1047db350873f5515fa7d84ed489f21ea1b6 SHA-256: d756c22b60f4937b979fabaa43f4ed379ac1828878784b5259935e477ee53df5
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, indicates a lure related to 'skeletal system worksheet pdf answers', likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=skeletal+system+worksheet+pdf+answers PDF link annotation
    • http://vazewuxu.mywebcommunity.org/zotub.pdfIn PDF document text
    • https://fusewire.weebly.com/uploads/1/3/0/7/130776481/5b681ae9d0191d.pdfIn PDF document text
    • http://uscarins.info/14574403269w2qpi.pdfIn PDF document text
    • https://cdn.sqhk.co/pipezifiwip/7hhgjgc/topical_steroid_use_guidelines.pdfIn PDF document text
    • https://dozolujikofirig.weebly.com/uploads/1/3/1/8/131856703/mamogefaxopow_vovifipademibim_javewajivi_mufidibeb.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/IVUjdXb/13057896418.pdfIn PDF document text
    • http://opensalon.xyz/43770764681gl1ye.pdfIn PDF document text
    • http://prod-fruit.space/sobuwalojekiralw0.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzaxube/LiiNhhI/tower_defense_infinite_war_tephas_fork.pdfIn PDF document text
    • https://cdn.sqhk.co/vutazazu/lfWDZmR/food_product_spec_sheet_template.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/zubanoporufuzi.pdfIn PDF document text
    • https://gufogirim.weebly.com/uploads/1/3/5/9/135967500/7d185b01549.pdfIn PDF document text
    • http://nijalatol.mypressonline.com/zitexaz.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/d5f7c55.pdfIn PDF document text
    • http://magnetfix.store/what_type_of_oil_does_a_2013_honda_accord_takeh61ym.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446765/normal_5fcd0a679ddab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455884/normal_5fcb1167daeb0.pdfIn PDF document text
    • https://fotaluxig.weebly.com/uploads/1/3/5/9/135973299/lufovekejexud_wosukoze_gopiw.pdfIn PDF document text
    • http://good-production11.site/pirates_of_the_caribbean_easy_piano_sheet_music_freefhtgs.pdfIn PDF document text
    • https://cdn.sqhk.co/zabeluzitema/5QgcXid/43220616403.pdfIn PDF document text
    • http://vomamafawib.scienceontheweb.net/98006653288.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444643/normal_6031e3248c7d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 5644 bytes
SHA-256: 96c4dab74c06212fad2f246ad8564628459dc6802ab8921e8ad2d3f27393fe51
font_01_sfnt_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 10296 bytes
SHA-256: b70fc2cf3830bdb698fea45c6858261fd3e2686a0315fe30a8562b78cbff17cd

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