Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f344890989ecf5…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 18:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 364b640347192a3dedee7ae41a67a2d4 SHA-1: 979095c8033d1f10d79ff353a32981132be43d57 SHA-256: f1f344890989ecf5c5245ac50d93cfb5affa92e42119fbae272749891bf6acc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to potentially malicious or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://isemya.by/modules/ariol/static/ariol/ckfinder/files/92954331702.pdf In PDF document text
    • https://shiokuda2.com/contents/files/ruzobifidumulovukawosoza.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210925175928.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///xiwowovifevad.pdfIn PDF document text
    • https://bnovum.hu/downloads/xevit.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/gewexovabizebenajabi.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/wogowifaravixopuj.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/ravuwidi.pdfIn PDF document text
    • https://ms2oke.com/contents/files/83455059333.pdfIn PDF document text
    • http://snsi.jp/image/news_file/wotalipikuxazezijixikusel.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/sidof.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/zobupogosudixazonatapuru.pdfIn PDF document text
    • https://tuinvandecruys.be/file/nawizeda.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/7022819fd309fb0b0dee82ca21acd35e/74365428837.pdfIn PDF document text
    • http://panova-art.com/files/file/77207692824.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/bojolasonumopiwadebifu.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/pepita.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/8899623493.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64506562955.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/636249176.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/kovodanurodevofaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cricket+guru+live+line+apkPDF 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_off0000ad17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD17 10552 bytes
SHA-256: 63d60d549ff3110db7d8187951f35e5aaf1f1ddef347563c9470d8a46323346d
font_01_sfnt_off0000c551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC551 16964 bytes
SHA-256: cf3f7a26ca15760d6385ce43c139625d3f0d83cb1c7a2a750187b11f02fbd86b
font_02_sfnt_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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