Malicious PDF — malware analysis report

Static analysis result for SHA-256 8841ffe1c4108e99…

MALICIOUS

PDF

75.9 KB Created: 2021-03-20 21:06:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf7fd7ed7de16d28994c92be0f076206 SHA-1: 7ec5f3c4cfc2b7efd922389fdb2e1cf079bd64c8 SHA-256: 8841ffe1c4108e9962d8bbf6adbeb55378aa31cf9f73ddc6ef90ad79161327f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to PDFs hosted on CDNs, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and external links are indicative of a spearphishing attachment designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=catering+management+book+pdf
    • https://cdn.sqhk.co/rupomotiz/jc3iewQ/trending_viral_videos_download.pdf
    • https://cdn.sqhk.co/susojareb/hjjfibF/nashville_smart_start.pdf
    • https://cdn.sqhk.co/vazoguzo/jdXQKGG/90770293516.pdf
    • https://cdn.sqhk.co/pobefozo/LhhPQhb/29040852699.pdf
    • https://cdn-cms.f-static.net/uploads/4454304/normal_6053360ee3b85.pdf
    • https://cdn.sqhk.co/dorodidur/kihfPYV/infectious_definition_in_science.pdf
    • https://cdn.sqhk.co/xakurusuk/oicAv4K/water_ring_toss_3d_puzzle_game.pdf
    • https://static.s123-cdn-static.com/uploads/4461761/normal_5ff53ef5ba601.pdf
    • https://cdn-cms.f-static.net/uploads/4485310/normal_5fe61893ac53c.pdf
    • https://cdn.sqhk.co/badexejos/ajbnRie/free_uc_browser_mini_apk.pdf
    • https://cdn.sqhk.co/xuxofidipo/ibgexBN/zokudaruxufakoxisemas.pdf
    • https://cdn.sqhk.co/divoxisig/1n9ibNC/zelotezazebosopunigumujuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vosimalume/pufisanobovulefawafages.pdf
    • https://s3.amazonaws.com/kozibowisenatu/adobe_ocr_to_word.pdf
    • https://s3.amazonaws.com/safago/crumlin_integrated_college_inspection_report.pdf
    • http://vevojadiren.epizy.com/allen__heath_gl2400-24_review.pdf
    • https://s3.amazonaws.com/jumedemimo/nobody_mean_more_to_me_than_you_summary.pdf
    • https://s3.amazonaws.com/polexebuj/19587255433.pdf
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_b12e95096812472d9f545c4cb67316ee.pdf?index=true
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_64278c8c633a4c50b17d2ec6615687ea.pdf?index=true
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_c4ddd8cdb869420bb806c32c55bcd2ca.pdf?index=true
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_180bea603c1a4c8ca3574c1a12b26a9b.pdf?index=true
    • http://lofolup.rf.gd/2017_amc_10b_problem_17.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc9f.bin
e5e5c83ef044fafbbca4618c6309184151161c1a637ea771982a4a0ce21ff4eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9F 5164 bytes
font_01_sfnt_off0000ee1c.bin
edabd624ce5870986efc88a7734c5b49b9083dccdac91347e66a84540e62d2d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 11148 bytes
font_02_sfnt_off000113f9.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113F9 4324 bytes

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