Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb7727b57247267…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 08:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63bbceec4d6eabc0faf06efd25300d7f SHA-1: 27efde619fa90f3bb496b1d14d0deab8ed05fa68 SHA-256: cfb7727b57247267239a37c321e67ee20ddb1bebd338057fb1535a76a1100d08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to potentially harmful websites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=react+native+with+java
    • http://alarm.pl/userfiles/file/44249861120.pdf
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/91916668229.pdf
    • http://lerucherdesanges.fr/userfiles/file/23838128815.pdf
    • https://jotekonybakterium.hu/userfiles/files/kigalifu.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eee8e699f7---2307084595.pdf
    • http://precisao.net/files/files/99050691846.pdf
    • http://kabaretyimpresariat.pl/Upload/file/96748780134.pdf
    • http://mkbeauty.vn/luutru/files/31356680160.pdf
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/dababonalizisixokaror.pdf
    • https://motodubai.com/uploaded_images/files/defagaragov.pdf
    • http://jdjcnc.com/upfolder/e/files/20210918094729.pdf
    • https://textmakareknutsson.se/upload/image/79383221988.pdf
    • https://adamant54.ru/userfiles/files/91978814349.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161480529c183f---puxinakefabamaja.pdf
    • https://zhavezbozi.cz/data/file/vawapi.pdf
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/28694335753.pdf
    • https://dialogueinpraxis.net/files/docs/93491219853.pdf
    • http://rudolphalexander.com/uploads/files/panivulukilagumosa.pdf
    • http://betheaskssd.com/flash/betheaskssd.com/file/nubimupewoturidiniriku.pdf
    • https://spcinternational.in/ckfinder/userfiles/files/luvarilu.pdf
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/68403641730.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_off0000dc9b.bin
2aa7444885a0cd2ba5ffcf39311e208d73736cfceabc1b7890dc669fe4cb434d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 10220 bytes
font_01_sfnt_off0000f372.bin
254a433a63e8bfae4d3eb7d300db990c18ff9fd0ee6c9782c095da68d0afdce3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 19272 bytes
font_02_sfnt_off00012545.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12545 16792 bytes

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