Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b210cc4ade37d2…

MALICIOUS

PDF

73.3 KB Created: 2021-09-23 18:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fe352948ab36b051b54a9cb8ec790ad SHA-1: c89afef9e20d05efdb12230c7c1fb259c9576923 SHA-256: 83b210cc4ade37d2362594645a57cc51634eea6e9ebc21cafb42af00b5337316
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the PDF's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://aftckwt.com/uploads/file/zujimemogusotuzapof.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/88987195347.pdf
    • http://www.psyforyou.nl/upload/fckeditor/file/piburulapoginib.pdf
    • http://werder-ritter.de/UserFiles/File/83200436672.pdf
    • http://linklandhotels.com/upfile/editor/files/50329305487.pdf
    • http://shannonlakeestates.org/fck_images/file/53820271782.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/fuzajunazuzifex.pdf
    • https://casalindasbakery.com/ckfinder/userfiles/files/99930002428.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145aa07b8089---93037745388.pdf
    • http://ebiocell.com/uploadfile/file///2021090302095975.pdf
    • https://sportsht.com/userfiles/file/93110763032.pdf
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84353093950.pdf
    • https://thefertilizerequipment.com/d/files/40767202615.pdf
    • http://hoshitorionline.com/uploads/files/dotajixeridetofupe.pdf
    • http://kfoodntea.com/dataroom/file/rawobapedapozupevuwar.pdf
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/nisukevabunexezuvogis.pdf
    • https://expobar.vn/app/webroot/files/images/pages/files/23075692392.pdf
    • http://vonschickenconcord.com/uploads/files/93341319195.pdf
    • http://yangpupark.com/uploadfile/files/wewanopatujuku.pdf
    • http://punaide.com/userfiles/files/sinefesulefotuj.pdf
    • http://stellar-toys.com/ckfinder/userfiles/files/64373630261.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+set+android+home+screen
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD98 16792 bytes
font_01_sfnt_off0000d5af.bin
7c62928825397b05034e5cfd45f7f7c4d61f6957f9e0c6b3e2fbdfa8483d3dec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 10668 bytes
font_02_sfnt_off0000edf4.bin
a529833daaae4b173740d0616496f5c542629e8373ce97f93da115584a021478		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 16408 bytes

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