Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a94f6bf57f4d43…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 01:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3f2a9998913325cca41277a33906e658 SHA-1: 83f08fad450c403a88d576d1f90351a61c51254b SHA-256: a1a94f6bf57f4d430ed5c0904c5f044291f9178fc92147c3016ce1cdf1bee666
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to various PDF files hosted on different domains, indicating a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ellenia3.eu/userfiles/files/zofugibagijadivi.pdf In PDF document text
    • https://mashtalkandil.com/userfiles/file/xebaxibazajuvujupebenug.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/xafonarigerumefafixumawew.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/takekelug.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090210300218.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/zuzizaz.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/pupuwibaleteserulodo.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/21420140493.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/6477470223.pdfIn PDF document text
    • https://hgb.se/filer/file/4774575330.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/903992f78b25981ae58761269d7425e6/lelogoposul.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/2021982053298365.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130a4e8a9436---lunefawov.pdfIn PDF document text
    • http://saint-party.com/media/file/woxepebenebutaniduje.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/punifupivimokoginuxafex.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/15285305432.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/paxogo.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/buxenoxezupagatevodosa.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/47502061003.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/guwimepufuzufasub.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/ponufuruzakukuv.pdfIn PDF document text
    • http://meta-min.com/files/97654416366.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/50087041574.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/telatukokewalaxapimas.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/62854726806.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090506294773499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=eset+poweliks+cleanerPDF 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_off0000be96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE96 16920 bytes
SHA-256: a779ee1d7e8f5346bfb153f92bf97f017ebae35db9cca083bba4e761059c51f8
font_01_sfnt_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 10528 bytes
SHA-256: 5587cda410c274caa6b8ea0326e5f7181a6b09877a4374b8cc3639017a0b8e45
font_02_sfnt_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 19584 bytes
SHA-256: 4697544a669b576e8b64264ac8171f1c1f211eca24539fb6233707d9ea13f449
font_03_sfnt_off00012207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1