Malicious PDF — malware analysis report

Static analysis result for SHA-256 510affab1784d949…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 13:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d9f60525160cac0c834f57df0ab27907 SHA-1: d23ddb7b724e1f18d5ab73423ec591f4fd2f2e8c SHA-256: 510affab1784d949f9523354a4b9a778102ed308f4b3ca2ffe10410ce62ab698
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting it functions as a link farm. This pattern is commonly used for phishing or to distribute further stages of malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://hoanghaie.com/Images_upload/files/63068207944.pdf In PDF document text
    • http://bulk-supplies.com/userfiles/files/vipaworiloxejirofu.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/jujaluj.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/47352404940.pdfIn PDF document text
    • http://charivne.info/images/file/26577093938.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/selonukutepitibenozi.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/73843063027.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/wenirolegokatetewirajefa.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/nijavuzadikifoxe.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/wurezorawidijukazazeramu.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/gitopiwazuzuso.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/58888834686.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/20975860233.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/20871233755.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/18765451205.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210916081646.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/pexefolajixozimedepaxize.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d8bda4d72---jipos.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130bbe7bf9a5---nixizadu.pdfIn PDF document text
    • http://sfssolution.com/userfiles/file/30616154786.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109010223542164.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/74708078892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+happiest+refugee+pdfPDF 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_off0000c18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18B 17408 bytes
SHA-256: 528f799289930f4fd2d795c2a57930dd35242ecb891b7f0bef87d95898ddbb00
font_01_sfnt_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 10568 bytes
SHA-256: 12aa813d298d9f2ec37676acbc50f0748faccc6ac7e9502e376342e014ea2c1a

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