Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7ccd7e74e27155…

MALICIOUS

PDF

119.7 KB Created: 2021-09-12 14:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 5d35390b905782716a3f97ea09b4d29d SHA-1: dd816cbc90bc7cb69ed4aac14ae6ce20198f0948 SHA-256: 7d7ccd7e74e27155b0c63da78c2d217decec3ba40764845430c8355b2cd81770
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous distinct domains, which is a common tactic for phishing or distributing further malware. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm heuristic indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://oncallanatomist.org/ckfinder/userfiles/files/37205282871.pdf In PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/57646252822.pdfIn PDF document text
    • http://chromoink.com/updates/file/76410095395.pdfIn PDF document text
    • https://citytrafik.nu/images/file/24957384402.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/baxiporiwogozot.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/visav.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/zewixujawipobolapovevit.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/wemutudujopomenevejimiga.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/molube.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/31550616582.pdfIn PDF document text
    • http://tion.hu/upload/file/3978551974.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/15386318659.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/kunax.pdfIn PDF document text
    • http://metall-press.ru/files/49168990210.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/jetevorediwi.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pufexamupogasepixafivovaj.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/84636284860.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/52893456156.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/58987445607.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/nifilufamazuvonufokewal.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/bubanavizivubanuko.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/gizajafijeberewu.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/majidafawadowiris.pdfIn PDF document text
    • https://makenie.com/upload/files/80240273166.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/guboramovukemurozokaze.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/90660373168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=obscure+nes+gamesPDF 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_off0001721b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1721B 10480 bytes
SHA-256: 939a61d03c0b21628947ea5ed84ca96a5b79f30d4fb9217d609486d41ac9a3ce
font_01_sfnt_off000189f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189F6 18224 bytes
SHA-256: 347afa2acc04174c0eaa3670a4709622954a37e23901bd9f2d2cd1060a6229f8
font_02_sfnt_off0001b8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1