Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac346947d1297b7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 02:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd1d853b36081ad11cd55f6b308f0ec9 SHA-1: 925cd4ece0f4d3cf99e409d4e5415337e83c29e0 SHA-256: aac346947d1297b71d85e2acb963c17e1b64a3ad67134ff7255a98312541aa38
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to potentially malicious domains, suggesting it acts as a lure or dropper for further malicious content. The presence of a 'download button' heuristic further supports this, implying a phishing or malware distribution workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://lideregitimpaketleri.com/calisma2/files/uploads/24508696551.pdf
    • http://hidramaco.com/files/files/84061452432.pdf
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/44237244586.pdf
    • http://orenprom.com/img/account/file/xamapazesoxisefabeturewe.pdf
    • https://gikguamerica.com/userfiles/file/54167361478.pdf
    • http://qdjshg.com/files/file/zunikipasatubojelazubolu.pdf
    • http://lukinserv.hu/file/5410135169.pdf
    • http://mywayrtk.info/userfiles/file/35004278870.pdf
    • http://shopgraeagle.com/ckeditor/uploads/files/rewijerasizute.pdf
    • https://etimes.mn/uploads/files/zubamaxosekebenokirolos.pdf
    • http://chinajnbt.com/images/upload/File/14742955571.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/43138552816.pdf
    • http://siddharpeedam.org/userfiles/file/
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bb02171f---domuse.pdf
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/57357465288.pdf
    • https://tjpapigroup3.com/contents/files/12950754431.pdf
    • http://annassteen.com/ckfinder/userfiles/files/lutotaziginan.pdf
    • http://metafelix.it/userfiles/files/41982021626.pdf
    • http://uniquehotelsolutions.com/files/others/16939404557.pdf
    • http://ukonlinedirect.com/userfiles/files/magutapetutexo.pdf
    • http://www.dawnrotaryclub.tw/UserFiles/files/40375237948.pdf
    • http://cofetariafraguta.ro/UserFiles/file/12317468048.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=can+android+emulate+ps2
    • 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_off0000dcb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 16792 bytes
font_01_sfnt_off0000f4c9.bin
5de14ff79564a2d882ba23fdb23860b237f18b2615145fe6388c7878aae278e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 10804 bytes
font_02_sfnt_off00010db4.bin
c93f4ed3dfa12988b77eaa6633d0898da727d0509ad2caeb1b6b47f909dab1b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 17880 bytes

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