Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9b10652115b96c…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 00:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a902b15b42e832dc176f6e8289b7692 SHA-1: 7f2d2e7172bb1b8ee314b91929bdb1fafe95de22 SHA-256: 9c9b10652115b96cf484f2165b83fa612de2110af3a1bee9e7d67d1d672b96c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs, including one pointing to 'crewmak.ru' with a query parameter suggesting a lure for 'minecraft full android apk'. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a phishing or malware distribution intent. No scripts were extracted, but the presence of multiple external links suggests the PDF is designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://crewmak.ru/uplcv?utm_term=minecraft+full+android+apk PDF link annotation
    • https://ijpdua.com/contents/files/sezowarezuzezevubudifubub.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/64853177402.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/kasuxekugipokoj.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/79552127839.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/zorizuxiv.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/69299770357.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0pb97h857ch54dj19c8mhbd47l/bolupevevakup.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/rimajiriku.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/36076004480.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/22488635851.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/lozupawenabitel.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/jifoxam.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/nubozawirerunugajika.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/23151765616.pdfIn PDF document text
    • http://tridiart.cl/ckfinder/userfiles/files/pofemurepar.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/zuxubomojazofufozolisufuj.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/mapovul.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/91435764519.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/35548092954.pdfIn PDF document text
    • http://royalgroup.at/tmp/sawazurinu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161501bc19f89d---41980415678.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/47963744189.pdfIn PDF document text
    • https://fptica.ru/images/file/95779518750.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_off0000b005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB005 14944 bytes
SHA-256: 2fe671cd27f83c0c812cde880f9d25a35e26dbd50972bff227c9f2a0520db045
font_01_sfnt_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 10628 bytes
SHA-256: ed709c60f6e9ce2edabb6761c2a5f8bd73300418e4adad2c3e4a69279c5607d2
font_02_sfnt_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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