Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aacfdcdded8becc…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 22:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0fc6c72232ab309ca400a74d4b2f90c5 SHA-1: ada0b852e8c42ad3bfcc1df30c4fabad9589019a SHA-256: 8aacfdcdded8becc86274cf453ecf40ddb9f9d72baea3e88d6625ef3800d6a6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for initial access via spearphishing attachments, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://iieng.org/editor/ckfinder/userfiles/files/89947491235.pdf In PDF document text
    • http://scsychem.com/upload/files/92343249307.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/mugidugitexijagogovotit.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/ragulenenetezilazeweb.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/purufade.pdfIn PDF document text
    • http://builderall.info/userfiles/file/kavazot.pdfIn PDF document text
    • https://ptogel2.com/contents/files/74534016457.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/rotopedafun.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/deparesotowapixiperopav.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/98530371568.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/71987957037.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/50059115060.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210909_DCD7819117C49E3A.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/53469933815.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354c0c18c9b---lorevulutivunutigepi.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/vaziwukokuvuxobitolivem.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/44442692467.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/33873423548.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/3jf34ggoe0a0i9u9v656umag9l/gulejebofinogojoliz.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/60727547649.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0908/b94718ec454cd2c2e549348e94b3b92e.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/tifikajaborelagusar.pdfIn PDF document text
    • https://adikkedua.com/contents/files/12303519893.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/zolinijerakuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=bollywood+movies+download+sites+free+hdPDF 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_off0000df33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 10936 bytes
SHA-256: cbd8d9eb675cc8fcfa0ad95b67b646be6256dd0cdd4b23d73314acf3f323d922
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 17548 bytes
SHA-256: a7bd740144f8a1fa9986c17ee11207b9e74d3ba3946724c321f56d24165cc242
font_02_sfnt_off00012626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1