Malicious PDF — malware analysis report

Static analysis result for SHA-256 2049847a4aaaf256…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 19:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74e8ffdd24320814a6ffb5320d3064fa SHA-1: c5a6df191e93c72b716a5aa9853d197c753db2e4 SHA-256: 2049847a4aaaf256b2bb35d0ceb927060720a0ecdb69cefbff0f71d3c8d44a80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristic firings point to the PDF acting as a link farm, redirecting users to various external URLs, some of which are hosted on disposable domains. The presence of embedded URLs suggests an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=anxious+in+a+sentence
    • http://tvkinter.com/file_media/file_image/file/kipogogurebawodoxaf.pdf
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/61497365570.pdf
    • https://pbchistoryonline.org/uploads/file/bimosonovevudetedul.pdf
    • http://geteffective.biz/uploadfiles/file/34816983467.pdf
    • http://www.radio-kum.si/data/files/77262623999.pdf
    • http://fundacionecla.org/resources/original/file/26001674544.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de2e9b2176.pdf
    • http://shepardinteriordesign.com/rw/upload/file/satatakurisu.pdf
    • https://fetogram.com/images/upload/files/totoragatuwuselekasemo.pdf
    • http://self119.net/upload/userfiles/2021/09/files/210910162526.pdf
    • http://mcserpenti.com/userfiles/file/87315444295.pdf
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/konuzidasabu.pdf
    • http://gestaocipa.com/public_html/Imagens/file/nepexarotemepugobot.pdf
    • http://springgalleryng.com/Images_upload/files/matip.pdf
    • http://gelikonline.ru/content/Files/86640217175.pdf
    • http://kripasec.com/userfiles/file/tetixigurudikowadak.pdf
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/tugomosejulovusipebesan.pdf
    • https://mmoxx.mn/userfiles/files/xufowa.pdf
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/vixexon.pdf
    • http://change4best.ru/upload/file/gafelul.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319ce2042bd---xuditomotazide.pdf
    • https://ciiinnovationsummit.com/ci/userfiles/files/54935416516.pdf
    • https://kurishupally.org/userfiles/file/46909294228.pdf
    • http://studiotecnicodavico.eu/userfiles/files/giwenubamipunujuvutudi.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_off0000d9cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 16792 bytes
font_01_sfnt_off0000f1e4.bin
bf059ce5a02f9fc8da52a1981cf65ce603abcc3d7e4164a415127ae7d6eb04a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 10260 bytes
font_02_sfnt_off00010931.bin
7d4f7d9a560843c87df1b9cde0e96f00e50ef6e14beed6e878130e0c037eb294		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 18396 bytes

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