Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9832fd8b0c0d574…

MALICIOUS

PDF

76.9 KB Created: 2021-09-23 18:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08b7bdd4122e71b48a9700aea5801ddc SHA-1: 460671639a20be341c1049a85e55c9fbd91c0472 SHA-256: a9832fd8b0c0d574a59cdfa5d3e395ed574264900244df5340ec583649eb0647
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to download and execute additional malicious content. The heuristic firings, including 'ML_NYX_PDF_MALICIOUS' and 'SE_PASSWORD_ARCHIVE_LURE', strongly suggest a malicious intent, likely involving phishing or credential theft. The presence of JavaScript points to T1059.007, and the overall nature of the PDF as a lure for further malicious activity aligns with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=android+app+clone+source+code PDF link annotation
    • http://101-games.ru/images/uploads/files/wekotodarisuvovomiwamol.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/93453482979.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/subujumaxeruzoriwuji.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/70184543140.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/19229396454.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210923164934.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/pijukovikig.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/zigulelusakutimupuxukef.pdfIn PDF document text
    • http://sinostandards.net/upload/files/wagofovapeforaguju.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/38595968036.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/firatozezipejesit.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/38168589279.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/48813902522.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210917092854.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/10682561499.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/13031262939.pdfIn PDF document text
    • http://rinsacars.com/files/others/32706552105.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/sixapemilavutuv.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/popojosirusoxijaburuvov.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/sekatumem.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/3823097463.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/tumasuribemamenilabone.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/fojomamuk.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/12641877121.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/84446249327.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/69953272578.pdfIn PDF document text
    • http://infracsap.hu/files/file/zigarodivenalikajegisew.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_off0000c59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59C 10488 bytes
SHA-256: 3fb862683fd5874a5ee61a114e1e7e7798996fe113fdd3afdbb34630bf5a32fd
font_01_sfnt_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 18408 bytes
SHA-256: ea3d39ddc2bc36601608cd405d2e181215ee70fb9d61e85a01d4309c7a987b0f