Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a0d8b6e6d8463e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 12:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd5c26b2bb9607fb6c79de43983d3cb5 SHA-1: f7ac4302dc1766560cf7e5642d0e59373af3ec85 SHA-256: 84a0d8b6e6d8463e28f18e7d39e36514bb62ddfc99020084cbc0a2e009a3b712
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to unknown PDF files on suspicious domains, indicating a link farm designed to lure users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://alquimia.in/admin/fckeditor/editorfile/63268758518.pdf In PDF document text
    • http://i-daa-wl.de/userfiles/57492391506.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/87813579706.pdfIn PDF document text
    • https://hotelcorona.ro/files/70015151387.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/suxifu.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/53853640677.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/78202131013.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/nesupalufifodovuwedel.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/40255783345.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/83389852177.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/93679185397.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/fefefuvukimumudegufo.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/xenesaxeretivubegefele.pdfIn PDF document text
    • http://cartopack.com/Images/file/rarefojepapuxixu.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/20661471130.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/18896648587.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/22422701699.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/jopimupasewix.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/98223538365.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/mokazitemarefilisizax.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/fosejavefiwisaverad.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/96560793820.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/69151287224.pdfIn PDF document text
    • http://adice-area.com/pictures/files/wozadanamadedokapiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dragon+ball+games+for+android+mobilePDF 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_off0000b2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD8 16956 bytes
SHA-256: 02ef1e089cbf792d65b13fa4fda9b148513609d2e4d8040bf831fe3350f134da
font_02_sfnt_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 10740 bytes
SHA-256: 6a9d1a038626b3ceefaf7a8097cc046df926d6786815b976bb74ea7dc8891f81

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