Malicious PDF — malware analysis report

Static analysis result for SHA-256 16208fef22c7e4f4…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 20:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e8cbf0a7d5838157e85042f6b847c1e SHA-1: 3ce954c71d597b88569fbddbc1d42eb3feff6d43 SHA-256: 16208fef22c7e4f4d4d94050a39c55ffbd36eb2f011398088f1f67bf8d5f6b6f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to numerous PDF files hosted on various domains. The presence of 'utm_term_redirector=True' suggests an attempt to manipulate search engine results or track user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://warungmimpishio2.com/contents/files/1119949382.pdf In PDF document text
    • http://h04ydivan.ru/userfiles/file/mugurunak.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/69073246102.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/zovimogotajo.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/rexunabexekifafud.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/37794993340.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/futoxik.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/33903934466.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/potafixi.pdfIn PDF document text
    • https://austarpharma.com/upload/files/4813390077.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/titumejubibejuwojod.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/14696222543.pdfIn PDF document text
    • http://pasted-radio.de/web/files/kekosuwojevoxoxolipege.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/todagabofajapuxopixowo.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/funutif.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/78495884903.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/85855113377.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/zedejobulujunekemumide.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/76206960092.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/92095202042.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/zajufavan.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/jerafegumidisorulozejoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chemist+tannum+sandsPDF 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_off0000c797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC797 19636 bytes
SHA-256: bbb3a24531e443504b1c6fbdc3161b61beceb82738adeea973e858e2f14f85d1
font_01_sfnt_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C3 10376 bytes
SHA-256: 80079dfe68da7e01d813f843c0229c2093e00e7d65436a4b4ae18fb8ae4707e4

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