Malicious PDF — malware analysis report

Static analysis result for SHA-256 792b927cd3ad9074…

MALICIOUS

PDF

78.4 KB Created: 2021-09-19 06:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aee97d2d17ef20d6f4333f0e2a087538 SHA-1: 3758740c851758a901716446e758e92d1fc421fd SHA-256: 792b927cd3ad907413ba582bdea64541827204c18a90bfb46d6fc9b93d7fb117
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. The presence of external URIs and a URI pointing to a raw IP address further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=jumanji+1+full+movie+in+english
    • http://africanhairbraidingsalon.com/userfiles/file/30643044676.pdf
    • https://semagro-msw.ru/pics/images/file/99767995779.pdf
    • http://gyermekhaz.hu/Content/site_images/files/91328621407.pdf
    • https://terracell.pt/images/file/32679968652.pdf
    • http://koddous.com/userfiles/file/vidakalime.pdf
    • https://hoatuoi360.vn/uploads/files/41251263374.pdf
    • http://mai-colle.jp/userfiles/file/werad.pdf
    • https://relaxbotanika.cz/ckfinder/userfiles/files/woporixe.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/97086049439.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1739fe7aece67f5aba7a0de28b6b005f/pekonoremuxotimaxim.pdf
    • http://location-venise.com/italie_documents/files/56063097141.pdf
    • https://sua.vn/uploads/userfiles/file/natavekub.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161413c029aeff---rasipeduje.pdf
    • http://arsvet.ru/img/upload/radaridafovofuzafedaga.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614688a22f919---vugesenasigojazosozen.pdf
    • https://unosms.us/userfiles/file/tanujolimolokojegolek.pdf
    • https://tsafar.ir/basefile/tsafarir/files/85025829824.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/fogizogawozazopa.pdf
    • http://gemculture.com/userfiles/file/39587822136.pdf
    • https://777mto.info/contents/files/56530535523.pdf
    • https://lockerova.eu/admin/upload/documents/25875257270.pdf
    • http://iuoooo.com/filespath/files/20210906045730.pdf
    • 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_off0000cf8e.bin
1b8e483753b4a295f026e84c0c830aa93c34f1b7aa8555c7844deb97ae4cfdae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8E 16728 bytes
font_01_sfnt_off0000fb2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 16792 bytes
font_02_sfnt_off00011342.bin
070e5d1d1b4df4a987355739833806ab38a4aa66c959337618805efb6df7c3aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 10804 bytes

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