Malicious PDF — malware analysis report

Static analysis result for SHA-256 48336c3e46de31f4…

MALICIOUS

PDF

77.1 KB Created: 2021-03-24 19:20:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5a9867008817c67b8e950791fd483605 SHA-1: 7674dde52e7337efeef3001d3728d4fdc6ba5826 SHA-256: 48336c3e46de31f443c404ef9f33f1848c0a2d7f82509a98d57d55033786396d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The presence of a malicious ClamAV detection and ML classifier score indicates a high likelihood of malicious intent. The document body, though heavily obfuscated, appears to reference a manual, suggesting a lure to disguise the malicious links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/wix?keyword=sperry+dm-210a+manual PDF link annotation
    • http://rabusog.22web.org/fubeposaxazat.pdfIn PDF document text
    • https://nalodewemutut.weebly.com/uploads/1/3/1/1/131164475/wilubi.pdfIn PDF document text
    • https://tozisodije.weebly.com/uploads/1/3/4/4/134486105/d9bd2c.pdfIn PDF document text
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/e620ab0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/foneniz/ap_calculus_10e.pdfIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_e003f47c4739486ca1710fbac614f269.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/sujok_acupressure_points_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/96926608377.pdfIn PDF document text
    • http://wizajevul.epizy.com/arabic_movies_with_english_subtitles_free.pdfIn PDF document text
    • http://tarudawifexizi.rf.gd/xixanozesujazawulenivo.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/76673165438.pdfIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_68a8bcbd12e443569defbba1ff5b0f48.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rorives/small_compress_online.pdfIn PDF document text
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_bc7f1e5f6b8a4f43aa5f10411a2be6b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/common_core_math_4th_grade_fractions.pdfIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_8d8c1ca63ae54f6aacda9d3579721773.pdf?index=trueIn PDF document text
    • http://godemesefiw.epizy.com/creative_writing_worksheets_for_grade_4.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_016fd8605608426ab68b1c959a0fcc67.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 5488 bytes
SHA-256: 8a820b9cf6881e1a37d97d2aa172bbab7e1059c0ad1a7a0bc0115381dd6a8daa
font_01_sfnt_off0000fff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 11576 bytes
SHA-256: 780a65d5f964e76ddfdd8a1c36ff4fe2002c02c801ad92d7140e29e7d63103bf

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