Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a85680c3b1adc9…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 23:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d7c45daa142839d99f66c896bc24c82 SHA-1: 976dc2a8de51b1a466cb8fab58b6aececeb81826 SHA-256: d8a85680c3b1adc9f37d4f799e83686d763ead9e2fad9923204c89f6aa7ce3f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and structured as a link farm, strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://odessawa.com/userfiles/file/tunatuluwuwajifawamifad.pdf In PDF document text
    • http://l-max.ru/userfiles/file/zekagomu.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/mofiniled.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/voxerefurevedutugofi.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/mowufugadiwesupelok.pdfIn PDF document text
    • http://hmed.vn/upload/files/lemorufedij.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/81895027605.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/45639382619.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/18920549090.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/pofepes.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/lowesiruvujiwe.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/80200772712.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/23562788928.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/32830017047.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2bb10c7af2ff5c80b11d111b9152c898/68578302473.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210916224632.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/31123091483.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/wirafobete.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614053bac2f8e---lawopuvofuwobowuzenarewij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=my+hotspot+does+not+work+on+my+laptopPDF 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_off0000d0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BC 10852 bytes
SHA-256: 106e6c5643ab0a469495179c9fdee5472992ec90c6e4f89b2654db81ad369906
font_01_sfnt_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 17204 bytes
SHA-256: 5679c9f6011d1b4ad403f2dd05949fd604431fcd75eede476d031f6f0fb496d2
font_02_sfnt_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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