Malicious PDF — malware analysis report

Static analysis result for SHA-256 11dcd27eae60e55c…

MALICIOUS

PDF

73.6 KB Created: 2021-09-15 20:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77f54fd4a4948045c17c2fb7da3ae622 SHA-1: 206d35a7dafc63a1326d4bdececdb7846e8ce265 SHA-256: 11dcd27eae60e55cadfc5efe9c2ebb7c98d0ef15f00ac5b0ed4679f675687e0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded links, including one identified as a link farm on disposable hosting, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://888nv.ru/userfiles/file/litaval.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/015d69a9af18e84cec8d63fb4030e3b5/53856563545.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138babc0f540---tipizojowenises.pdf
    • http://slovoveri.org/userfiles/zefasewimozamudumid.pdf
    • http://tubesealer.com/uploaded/file/1125708785612f33a4bf22f.pdf
    • http://wamer.org/userfiles/file/lixubalerixinutovafi.pdf
    • http://ljjxmining.com/uploadfile/file///2021090513564090.pdf
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/75920280641.pdf
    • http://vanharteyoga.nl/uploads/files/28892736103.pdf
    • http://chikatere.com/Upload/files/79957105380.pdf
    • http://mwflower.com/upimagesfile///85546760941.pdf
    • http://geredekombiservisi.com/userfiles/file/63445462884.pdf
    • http://sevinctekstil.com/resimler/files/fogozap.pdf
    • http://vdadanang.vn/app/webroot/assets/files/bibejifuni.pdf
    • http://sangtaoad.com/uploads/userfiles/file/difugugepis.pdf
    • http://showdoimovel.com/files/files/48077686775.pdf
    • http://rovitek.com/userfiles/file/67995970104.pdf
    • https://rybczewice.pl/userfiles/file/67038188107.pdf
    • https://officialbacknumber.com/editor_up/64309205385.pdf
    • https://bedandbreakfastholten.nl/userfiles/file/21396681062.pdf
    • https://negaratoto.com/contents/files/35621644023.pdf
    • https://gites-les-bardots.com/userfiles/file/12103220163.pdf
    • https://chennothinterios.com/uploads/file/20629698684.pdf
    • http://polenes.cl/userfiles/file/96033478228.pdf
    • https://haidangpc.com/contents/files/josavokozarisas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gangstar+vegas+mafia+game+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bba6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA6 16792 bytes
font_01_sfnt_off0000d3b8.bin
de31d86548c76c08807996446523e9f99432ab928d0f71df8abc6f1f47745996		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B8 17252 bytes
font_02_sfnt_off0000fff6.bin
a7d5f929af6d518e50d13d64cbad64fa11c12094a44e2e19f529a6c360d2bda5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 10888 bytes

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