Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7cd3d3b30ef217…

MALICIOUS

PDF

75.7 KB Created: 2021-09-20 00:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2b30bbedd938f441d7d6ec1c426e07d SHA-1: a4b2b9736e8adf9f4a3e978760665cd5ec15cf6a SHA-256: ac7cd3d3b30ef2175c138a2ce5da797ce58d1b1034bf81f2cf512ccc28b664e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating a link farm on disposable hosting, likely used to obscure the true destination or evade detection.

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 http://saltokisport.com/uploads/files/betoxupofozaviwo.pdf In PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56984874802.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/14388929120.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/ruvafos.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/80482153376.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/92783411106.pdfIn PDF document text
    • https://tekmaker.com/upload/files/69730738607.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/duxusi.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/fosovoxituzexotexen.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/dudiburemutunetaxobi.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/losab.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nesenobuvegatefexoteto.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/50052110956.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/98834094858.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/41444850432.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/zogidupafufurob.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/87820554277.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392f47def37---9070480111.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/posipedovosajoke.pdfIn PDF document text
    • http://steinemann-ag.ru/58372270971.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/42605053894.pdfIn PDF document text
    • https://camelcarpet.org/d/files/23740236749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=scary+teacher+free+download+apkPDF 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_off0000c338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC338 17380 bytes
SHA-256: e4be44e2c83c2ab86fb950adac96edc7146adaa06dba7ed81d629f6d70ae3bc6
font_01_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 10824 bytes
SHA-256: b4cdb70cb20d3ddde52ea0aaa3d369b31b19372c29ca2e9976abafd1487e07a1

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