Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d93b3cdfaec1a90…

MALICIOUS

PDF

80.6 KB Created: 2021-02-21 06:50:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 243ef86f18594810918e02daa85f037c SHA-1: 5d2af78002b4a2c1dbc51a3417eb7f7961822dde SHA-256: 4d93b3cdfaec1a90aa2413d1eb1488ccec22587adbf80d2704bb88ebf2bdf71a
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 domains like 'cdn.sqhk.co' and 'weebly.com', which are indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' confirm the attempt to direct users to a network of linked documents.

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 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.
  • 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://jacksth.ru/strik?utm_term=blades+in+the+dark+srd PDF link annotation
    • https://cdn.sqhk.co/pozedezupase/hamgjWi/35935524111.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/luUUheG/91745521881.pdfIn PDF document text
    • https://xesukalo.weebly.com/uploads/1/3/5/3/135311970/1154707.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/ajajfJk/gif_live_wallpaper_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/eneTjih/social_entrepreneurship_course_syllabus.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/d3kMVi5/98541891616.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuwaxisiw/gfHSjg7/affordable_house_painters_tucson.pdfIn PDF document text
    • https://cdn.sqhk.co/kogoruzojif/shdESwo/54703812728.pdfIn PDF document text
    • https://cdn.sqhk.co/papebikuwi/jiLggao/63409605158.pdfIn PDF document text
    • https://cdn.sqhk.co/giripiponi/ajjjigj/71468836244.pdfIn PDF document text
    • https://vafunaparixidi.weebly.com/uploads/1/3/4/6/134627598/rekufelu.pdfIn PDF document text
    • https://cdn.sqhk.co/gimenuxot/XSmjiie/among_us_cheat_skin_and_pet_apk.pdfIn PDF document text
    • https://bladesinthedark.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lefemijip/53469968395.pdfIn PDF document text
    • http://nelodetasa.rf.gd/guzoroxipezaju.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/experiencing_god_leader_s_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/enclave_questionnaire_answers_fallout_76.pdfIn PDF document text
    • http://gevewodex.epizy.com/alpha_bravo_charlie_episode_9.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 5024 bytes
SHA-256: cc58b66ee6c95deb82ed66c65f3fb83d18286a7f3f49f212f533b20cbd48e06a
font_01_sfnt_off00010ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFC 11008 bytes
SHA-256: 26301cf3e5dbd141161ac3c924a98b366971e73bed26deeb151228643a5cbdfa

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