Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a23d2fd031c261…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 07:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1de4bb8ff8bd344472d457d4fe0e9441 SHA-1: 529df43869eaf0ec89122378d5a8f149c39cb79f SHA-256: 11a23d2fd031c26189756dfa6d71df5d486c0a6b353b2af24fda6112b1fa4fff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://hongshengfish.com/uploadfiles/20210906/210906202210112965r0z456h6j20z.pdf
    • http://dodogs.ru/sites/default/files/file/55251821984.pdf
    • http://nemdanangpho.com/uploads/2021-09-05/images/files/rojuzofibesupodivon.pdf
    • http://bridgeonlaw.com/filespath/files/20210914022815.pdf
    • http://ajisushionline.com/uploads/files/jogejobebasavowutu.pdf
    • http://finance-bulldog.cz/UserFiles/File/47529693607.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/simowikavivu.pdf
    • http://www.centrosanmarco.eu/img/news/files/77373492297.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161403979abefb---sexat.pdf
    • http://www.hebrewforreadingcomprehension.com/content/wunomobo.pdf
    • https://bluetact.com/ckfinder/userfiles/files/3903079164.pdf
    • http://el-system.jp/uploads/2012/files/wexit.pdf
    • http://tingchucontrol.com/Uploadfiles/files/dofeja.pdf
    • http://huonglonghotel.com/uploads/image/files/84051345359.pdf
    • http://gniortho.com/files/Upload/file/88046368462.pdf
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/mobojesunulotuw.pdf
    • http://lngpetro.com/userfiles/file/voniduj.pdf
    • https://hantverksakuten.se/ckfinder/userfiles/files/395211363.pdf
    • https://alnahamgroup.com/userfiles/file/maparixa.pdf
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/34845151607.pdf
    • http://megaprestige.ru/uploads/files/81993904843.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/99152394820.pdf
    • http://akcompany.vn/uploads/userfiles/file/80235497964.pdf
    • http://abpaluso.com/upload/file/tosoliwatekokajekepomid.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=clean+master+tv+apk
    • 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_off0000cd3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3A 16792 bytes
font_01_sfnt_off0000e54c.bin
f037c7e774bebabfef54830e0d78fb41b5246dfc5058efa4e9a8e419c0fe275b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE54C 20944 bytes
font_02_sfnt_off00011b98.bin
698fee5889103903fd8c64a5e4741c7b4543db971ca8ca8d7d7d28e9e0a9afef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B98 10392 bytes

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