Malicious PDF — malware analysis report

Static analysis result for SHA-256 188eca0feb3be877…

MALICIOUS

PDF

81.7 KB Created: 2021-02-21 20:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 621d8b33c757c987a98bd0bd12854501 SHA-1: c28c2350ea9f949cb09e4fa43fadc0501aa903ff SHA-256: 188eca0feb3be877686dbba986e73f42bfc80649732114e69fa121de6fad207b
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 S3 buckets and Weebly-hosted PDFs, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://jottigo.ru/wix?keyword=shooting+game+unblocked+76', is directly embedded and likely serves as the lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jottigo.ru/wix?keyword=shooting+game+unblocked+76 PDF link annotation
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/7608678.pdfIn PDF document text
    • https://gunimumatepatu.weebly.com/uploads/1/3/5/3/135313318/7cce5c9d32d869.pdfIn PDF document text
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/cf3b0422ff8.pdfIn PDF document text
    • https://cdn.sqhk.co/lulaxujik/fPrgexL/lausanne_diamond_league_2020_tv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428331/normal_5ff48a98e51b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_60209b0d4c429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421778/normal_60183e915d11f.pdfIn PDF document text
    • https://vikisoxez.weebly.com/uploads/1/3/4/7/134712259/dogedujuk_roguraze_wuxudagirizojam.pdfIn PDF document text
    • https://pafetujesotizi.weebly.com/uploads/1/3/5/3/135348857/govapapukipilutu.pdfIn PDF document text
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/jewukimixowi-widofapuj-mugapete.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/kujesulad/dadaxavemijefa.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/industrial_craft_2_crafting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/pibevimam.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/measures_of_variation_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/kekubumusetafapa.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011474.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11474 21632 bytes
SHA-256: d30caebf561d144b09fa42160e1bc7159becf4955e19c24f66776e703068dea1
font_00_sfnt_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 5620 bytes
SHA-256: 280d8c372c2aa1986dce7a26ce5e7bd028366ea5142b797438df6be2531a9615
font_01_sfnt_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 10044 bytes
SHA-256: b3dede5d03d5fe4c6c12a051243f7441ac2824780da2a25fe8486cfdcfe94402

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