Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c079f2c501ee9eb…

MALICIOUS

PDF

67.3 KB Created: 2021-01-27 05:46:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 608ecaa0473e3597238873463476beba SHA-1: 98f5bd1de37d6ded8307fd52a17e6cdb3efeb05a SHA-256: 7c079f2c501ee9ebbe9e1fd26cbf5ebce2732b3a4f8673ecc4325aaa84504bf7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a link farm containing 30 external links, and a ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URLs, including one pointing to 'crophysi.ru', suggests an attempt to redirect the user to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malicious content delivery attempt.

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://crophysi.ru/123?utm_term=cary+school+gymnastics PDF link annotation
    • https://cdn.sqhk.co/sejarepezibo/bhadxjb/rich_girl_shopping_dress_up_fashion_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/gfgjIbB/64841768024.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/ghiTEpk/bike_simulator_game_for_pc_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/faxenukev/dCheche/97817494373.pdfIn PDF document text
    • https://lixepugoguzezum.weebly.com/uploads/1/3/4/1/134132265/tesabekur_dewedowebexi_fitesuredut_nakorukasob.pdfIn PDF document text
    • https://cdn.sqhk.co/kapideto/je9Zdjf/best_voice_recorder_app_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/gd4ifhh/52025506873.pdfIn PDF document text
    • https://maposege.weebly.com/uploads/1/3/1/3/131378999/d0cd47fa79.pdfIn PDF document text
    • https://josebugovoje.weebly.com/uploads/1/3/0/7/130738719/8317456.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/vajefam/math_practice_worksheets_algebra_2.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/2202479641.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/ccna_200-_125.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/repezegubasebebimewaji.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/maulid_berzanji_full.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/vefavuruxiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/candy_camera_all_version_apk.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_off0000ca40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA40 5220 bytes
SHA-256: 6ad9399553a3bb52d32bd124162fc70df69a203854b6463529300b103b5565b7
font_01_sfnt_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 10640 bytes
SHA-256: d5e909dce81cd6377efcbed14b69fafd0bdc2b0af3903ad1b59cffd7ccedbee3

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