Malicious PDF — malware analysis report

Static analysis result for SHA-256 90971711327f5654…

MALICIOUS

PDF

70.2 KB Created: 2021-02-15 12:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc1b05978d31f011a080aa1336ae00b2 SHA-1: 2d011592f0c5302efad0d3a2f4fbe4231ad8cad2 SHA-256: 90971711327f5654f3297a63c35632756cf4a5ee0ba5446a00bd4a621e5b5bd9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning model as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection strategy. The primary URL, 'https://seumenha.ru/wix?keyword=cell+city+project+answer+key', indicates a lure to a website that may host malicious content or phishing forms.

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-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://seumenha.ru/wix?keyword=cell+city+project+answer+key
    • https://cdn.sqhk.co/zepipawetopi/lieiigg/cute_halloween_costumes_for_couples_2020.pdf
    • https://cdn.sqhk.co/nutewakizi/d60cEW0/vexed_crossword_clue_6_letters.pdf
    • https://wajajudamivigo.weebly.com/uploads/1/3/4/3/134359543/19389c56d.pdf
    • https://cdn-cms.f-static.net/uploads/4464067/normal_5fd88fb99635e.pdf
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/150f4da8692a4.pdf
    • https://static.s123-cdn-static.com/uploads/4375077/normal_5fee916376e4e.pdf
    • https://cdn.sqhk.co/zozotetowa/iDphihd/paintball_gun_tank.pdf
    • https://cdn.sqhk.co/gotubosif/HWhhxib/filling_in_holes_in_wood_siding.pdf
    • https://cdn.sqhk.co/vibisidumes/iFjg39r/del_monte_bubble_fruit_nutrition_facts.pdf
    • https://cdn.sqhk.co/nilesatu/Ggdihos/ube_crinkle_cookies_nutrition_facts.pdf
    • https://static.s123-cdn-static.com/uploads/4379045/normal_5fcbc2cb3699c.pdf
    • https://static.s123-cdn-static.com/uploads/4383805/normal_5fdfd4d4ed5a8.pdf
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/leviwu-xibulopataviwa.pdf
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/e9d627e5c.pdf
    • https://cdn.sqhk.co/nivabetaz/ggdk2id/tuzetizok.pdf
    • https://venewosusi.weebly.com/uploads/1/3/1/3/131398385/pawol-kusumefiwido-gifizovupuvevis.pdf
    • https://cdn.sqhk.co/kupawusel/ehjLHig/the_banner_saga_2_events.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/setigafat/calendario_escolar_cyl_2019.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_off0000d263.bin
871d53f455c9205541a0ee112ec96bdc206cafd6488f16b00ab3883d1e167cbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD263 5164 bytes
font_01_sfnt_off0000e41d.bin
3553c55e7164f81a72037d82405e27d33e2013342ab68798f62a26e0aa5bc009		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 12148 bytes

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