Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3fee7e9c506ed2…

MALICIOUS

PDF

72.2 KB Created: 2021-09-24 14:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82bfe932247004860fab2c272eff4fc9 SHA-1: 81a863ca37de51ab22b8444998deef72ab0dc3db SHA-256: 9c3fee7e9c506ed2f5ad2a548c31dd4582f77d0096df319e9ee51ba88829e43b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malicious documents designed to redirect users to harmful sites.

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 https://pistant.ru/uplcv?utm_term=download+manga+in+pdf
    • https://huanghecables.com/d/files/beligunobedezazegumeralu.pdf
    • http://tandartsindex.nl/images/uploads/buwutobejizawopazelad.pdf
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/15275209809.pdf
    • http://tnslib.su/userfiles/files/81213199.pdf
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/15907891712.pdf
    • https://ntiverification.com/userfiles/file/48847544601.pdf
    • http://premo.at/userfiles/file/42647248051.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/govudu.pdf
    • http://podushka.by/files/files/79308459290.pdf
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/80816030837.pdf
    • http://baobianhkhang.com/upload/files/53495175071.pdf
    • http://somsit.com/ckfinder/userfiles/files/gotolusanuf.pdf
    • http://torgoborud.org/images/file/rolukumapufuwofemimofotiv.pdf
    • http://malir-naterac.info/UserFiles/File/10752605583.pdf
    • http://qapoll.com/2015/vat/upload/files/pavelodekibekesimewofu.pdf
    • http://twozonechickenlasvegas.com/uploads/files/fijajunuletuzuwasax.pdf
    • http://savalis.ru/userfiles/file/72747309831.pdf
    • https://toppelletmachine.com/d/files/nugajopejogosorodogawo.pdf
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/27220093894.pdf
    • http://diadiemvui.com/upload/files/govafewizazapuxikurabunet.pdf
    • https://seeyounow.net/userfiles/file/nexixurazinevilatumibanob.pdf
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/60636916272.pdf
    • https://www.institutvzdelavani.cz/files/fijifude.pdf
    • http://budget-pl.com/ckfinder/userfiles/files/89011952305.pdf
    • http://btfa.tw/upload/files/66951633608.pdf
    • 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_off0000b86e.bin
1a647f284c037d3bcd6b1736caf2611b9109f30cb66217c9edd202c734f21fc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB86E 10432 bytes
font_01_sfnt_off0000cfcb.bin
ef32a2093031642477b02f8b21d2d3b0d3327f0052c9028584db0a697e85abe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCB 17108 bytes
font_02_sfnt_off0000fafa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFA 16792 bytes

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