Malicious PDF — malware analysis report

Static analysis result for SHA-256 9740f036ce901052…

MALICIOUS

PDF

91.0 KB Created: 2021-09-20 23:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 075185f428e48275e5344585ce2a3edb SHA-1: 58f114458967b19dfd131c1f8df0d846f43a3d52 SHA-256: 9740f036ce9010526d46dee13b629f6e82dbbc4cb2a97449e945cf93c2d671f3
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external domains, many of which are hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://epmachine.ru/d/files/55358533015.pdf In PDF document text
    • https://spandoekland.nl/userfiles/file/65364390158.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/26370762757.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/63748943029.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210914_7EB8C2A945A79D29.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614862833fcda---67884242900.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/4723553564.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/2665853773.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021091012523073499.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/50032112036.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/milapa.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/78435200239.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/dagilawadofaburojufima.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/38654427042.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/65274939173.pdfIn PDF document text
    • http://northcity.rs/slike/files/vagabinifititefumamur.pdfIn PDF document text
    • http://acelybio.com/upload/files/ridinixo.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/linamojuzaxumeteluwanupij.pdfIn PDF document text
    • http://wych123.com/upload/files/zuvukosaluso.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/60087388547.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/72420275391.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/71298186850.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/sazisub.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210911135505.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/71269236095.pdfIn PDF document text
    • https://istanajp2.com/contents/files/58603673696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=american+racing+unblockedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 18420 bytes
SHA-256: 486c75a25510897a1cafbabf930af138338738476810796dbed47786e69190d0
font_01_sfnt_off000123ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EA 10760 bytes
SHA-256: e6c8cc9bc7796c1df104b1f9aba574605c4bb4260bf16588af8915aa07a0d5e7
font_02_sfnt_off00013c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C55 2192 bytes
SHA-256: cfb1580163e84f4efb6b278a67b6d9731dd035c0dfe3fc275b589aeb22e353f6
font_03_sfnt_off0001463f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1