Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec12e27dad2a13b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 20:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e2cf7dff1cbc5412bebd433b146f2f58 SHA-1: b793096845fdeedb3e10e96b72b88e10a5712444 SHA-256: 9ec12e27dad2a13b9ac95fd3e15104e549c2d77f6afea128505b6b30988af015
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The presence of external URI heuristics and the link farm detection further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://sweed-trans.eu/ckfinder/userfiles/files/ninosorugufuga.pdf In PDF document text
    • https://rosycaffe.com/file/wolalivipisegifoker.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/18300983589.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8de4daea31bbf008442d4f08951fde71/jejesoxibokufobidafasit.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-14/20210914054259486031.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/32724003872.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/nimetegu.pdfIn PDF document text
    • https://netlandschool.cl/files/juvopuvepezotavuxogosemaf.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/29300434011.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/pesojisexinusojuri.pdfIn PDF document text
    • https://aromamarketing.md/img/files/12942260207.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/bijawapawobenalo.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/zoxarobuguwemonujepu.pdfIn PDF document text
    • http://ustunongel.com/image/files/wefiwijire.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-9/20210909172005967086.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/reluliwudi.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///98864831902.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210920_222927.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/76072279320.pdfIn PDF document text
    • http://vit-physio.de/file/2371040302.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/92451506401.pdfIn PDF document text
    • http://acelybio.com/upload/files/kovuzowovupijake.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/59633662756.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/gabevimenugut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+omega+version+downloadPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCB 10736 bytes
SHA-256: 548862f0e48b40bacaabde9dd43965e0a1bf76cc1b29c28e85187be10f2b5a01
font_01_sfnt_off0000c84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 15616 bytes
SHA-256: c8e9526fd6a2d590daa37a6806f02a92d767ea29542948b549301c172dcc7fc7

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