Malicious PDF — malware analysis report

Static analysis result for SHA-256 1470daa62630d4c4…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 01:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e9bde04589dd95b7b1c98d256ea2751 SHA-1: 113d977122de6e97d5b892c57d6277fe5c6f0459 SHA-256: 1470daa62630d4c499ae360a9391c5cb766d6d63f1eb4711970905c81ad50865
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The document contains numerous embedded URLs pointing to various PDF files, suggesting an attempt to redirect users to potentially malicious content or phishing sites. The presence of multiple disposable hosts and UTM parameters in one URL further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://artesapanaderia.xyz/aym_image/files/wazanutotuvoso.pdf
    • http://lpxs168.com/filespath/files/20210903144751.pdf
    • http://coomargroup.com/ckfinder/userfiles/files/degofaturezesalib.pdf
    • http://metabolizmusonline.hu/images/upload/file/vevodi.pdf
    • http://antoniolescio.net/userfiles/files/9637964147.pdf
    • https://sassanoproperties.com/FCKeditor/file/73656737355.pdf
    • https://rybczewice.pl/userfiles/file/43408610942.pdf
    • https://biholka.cz/uploades/userfiles/file/98265610354.pdf
    • http://moscreen.in/cmsfiles/file/91730392401.pdf
    • https://4of100churchstreet.com/assets/media/files/77226851527.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613097828a4d1---jisinofedare.pdf
    • http://stjconsulting.it/userfiles/files/jisimotemepejizu.pdf
    • http://gruppocreta.com/userfiles/files/devebaduk.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161366be0ab9cb---77696553706.pdf
    • http://mtjjt.com/2013/upload/article/files/210914120509134186k4fu3.pdf
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/zavaniz.pdf
    • http://skisun.it/userfiles/files/89547702478.pdf
    • http://qianshunqs.com/admin/upload/doromewewubepar.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/59737827710.pdf
    • https://b2cexpressdemo.com/userfiles/file/sizuwes.pdf
    • https://fizjolech.pl/userfiles/file/5703684874.pdf
    • http://czyxchem.com/upload/files/suxufejenuxunesafeworowa.pdf
    • http://feriaalainversa.com/uploaded/files/fibijanavoverusarume.pdf
    • https://albawadiroad.com/userfiles/files/sitenagobixozugu.pdf
    • http://av72-reklama.ru/userfiles/file/16318126435f715bc4112ad9557655.pdf
    • http://kanomax-nsk.ru/images/45751872504.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+htc+android+software
    • 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_off0000bac1.bin
e780a9ad95d34dc588a147a81a2c1e10bcbd25b541232f04ecaaeda60d5b823d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC1 10660 bytes
font_01_sfnt_off0000d326.bin
dae61517c08099041ea0cc411791dbd13a1782799d566039401808207c241bbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD326 19020 bytes
font_02_sfnt_off00010492.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 16792 bytes

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