Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d73ed64f165d6a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 15:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8bd54544bb392b8fa6f437c13533c1d2 SHA-1: 7193b7185a5491e6e042031c40bc1ad2dbe48dfc SHA-256: 52d73ed64f165d6a5bebacc143a2621bb437631830057f9e060671f79a4803d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains multiple links to distinct, disposable hosts, suggesting a phishing or malware distribution scheme. The embedded URLs further support this, directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/uplcv?utm_term=mi+10+lite+vs+poco+x3+nfc PDF link annotation
    • http://makesrealsense.com/ckfinder/userfiles/files/98739657011.pdfIn PDF document text
    • http://inistor.com/ufiles/files/9760899265.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/21911182728.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/79789890831.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/8087612288.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bfb5cfec0---dobakivumal.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/sizitegop.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/dedazujizotifak.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/93999253072.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/nomatizeruzupup.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/10262792.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/64426121486.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/51280693159.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d7c4c9e3aa0a3efe89eb527b66b99d0d/17907122485.pdfIn PDF document text
    • 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_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 10720 bytes
SHA-256: d4bbccd169907f26005a4cec354c902eb2ffd81f70196fd4981b564389af9aed
font_01_sfnt_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 19148 bytes
SHA-256: 0009ee7af66324a1052c8538d5808c57a423c9e6e7000926e4a16a9df61f98d6
font_02_sfnt_off000123f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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