Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b12405b7dea408…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 02:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 822085167734c1164ab6134a051e9bba SHA-1: 025a819cd232b9570f74a9c5609d7dfaae0a73db SHA-256: d9b12405b7dea4083e5e61ede2105243c880264987ed531a2f9cd776d24ae178
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 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 https://synerhu.ru/uplcv?utm_term=c+est+quoi+un+portable+android PDF link annotation
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/f448116756609f7038a2dd00c7061f72/kupoge.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/palow.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/5634109163.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/zinesu.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/sukijegedibaxu.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/46185333810.pdfIn PDF document text
    • http://temple.mo/userfiles/file/26166700467.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/96537430330.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/bugupokagudaxugobazapa.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/lukofuvojewewosegenepepe.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/folavo.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/vegixeso.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/62160008653.pdfIn PDF document text
    • https://phuquiland.com/upload/files/41619956670.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/26492618528.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210831233119.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/dufoxuxodejirojazeguxeto.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/rivovan.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/zedujavakinu.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210913_120057.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/63183529873.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210909145818.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/69941076090.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/80876689341.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/sujawujomad.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/8179405114.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 19252 bytes
SHA-256: f5a75c1587506a555be80d8e84870596d07a4efe9424a21b69253782cb0ddb18
font_02_sfnt_off0001237f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 10800 bytes
SHA-256: 56f13cb323b6844ebb4eb13bfb711f1d787bf164ee01d88a5e64b3691dca5d10

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