Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcce9e8d881c1d1c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 01:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 542d58dd5e80cb9b30e679c61520c114 SHA-1: 6e2291e525b6aca88bd387a2fa83c103138415eb SHA-256: bcce9e8d881c1d1c0918f78aff3ccc23e91c6da55329cab2c7e35dd503d457c9
146 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drafthe.ru/uplcv?utm_term=free+galaxy+skin PDF link annotation
    • http://www.pattyn360.com/upload/forum/files/lebodemuxa.pdfIn PDF document text
    • https://ip-pharma.net/data/files/dosozate.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/wofurevavomefevero.pdfPDF link annotation
    • https://neksav.com/upload/ckfinder/files/1232997978.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409dade0725---kejifekositit.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/13000248202.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/80163149926.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16138be884f475---dezax.pdfIn PDF document text
    • https://menu2uplus.com/images/file/zogifabunir.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/vireropogawetex.pdfIn PDF document text
    • http://eternoohydro.com/d/files/movolozota.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/93557916619.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/2313741860.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210909021725.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/tipidaruwetowariroxu.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/34766792441.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/fafesewanete.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/tosiwerofud.pdfIn PDF document text
    • http://hanleyresources.com/images/bolenewalaw.pdfIn PDF document text
    • https://kawanmto.com/contents/files/pigutopozeja.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_off0000d380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD380 18028 bytes
SHA-256: eb60ee6a4b481e96badc1ce45bbb1bb25da09a8a413e090dfab2e533b958fd35
font_01_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 10352 bytes
SHA-256: a774b98d3858241397ec40eabe6306182b3756c685f741a33447df4052778b47
font_02_sfnt_off00011850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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