Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9701b7c120179ec…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 09:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85b917ecf02d5848b7bb2c34d06e41b8 SHA-1: a674bcfc87e17907eb0c1b42aea68969bacde1f9 SHA-256: b9701b7c120179ecbf4fd95764d75a74b344ab09d68e39a59ad370f082c95adf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous URLs hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this tactic, and the presence of embedded URLs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soc-in.com/data/media/files/gapegesu.pdf In PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/17137070368.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/zafusejugo.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/92106929100.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/63226893007.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161423f2f63369---114428461.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/botava.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/kujemopufakesefu.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/zakowemagujepel.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1632165823_c74bb206f0.pdfIn PDF document text
    • http://lecostationery.com/files/file/42470991539.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/76379052339.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/jovogi.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/37946069193.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/fivotufemebuvimovape.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/95549402925.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/20838832358.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/52028933650.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109052023397297.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/rogizegeb.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/58958640345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=relaxing+games+on+iphonePDF 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_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 18612 bytes
SHA-256: bf58d103878302233326ad52d6714806f7d8c9c865f433785025e2f5a9b010aa
font_01_sfnt_off00010bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EC 10648 bytes
SHA-256: 9db6d5ca854d0e39c39d0b454db356953e4beaa489dcde89bc05f20bf3bc77c2

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