Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a82758032e943e4…

MALICIOUS

PDF

74.6 KB Created: 2021-09-24 22:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9d73628e05941db7a70cb9da73d40eb SHA-1: d3b0429d64fc32241dead8c77dc5afecc31c1eae SHA-256: 2a82758032e943e4674907af8423a9e1a00884af24251272946b57af6de8386e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The presence of numerous embedded URLs, many pointing to unknown domains, suggests an attempt to direct users to malicious or unwanted content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly imply a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://mkpstroitel.ru/upload/files/mupul.pdf In PDF document text
    • http://cybernet.asia/UserFiles/File/nimanegepuworuz.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/riziliwikowexolujavifemo.pdfIn PDF document text
    • http://seritour.com/rsm/files/bilegikeruxamivekunawomos.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/miwuto.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109210024079103.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/78685543200.pdfIn PDF document text
    • http://strandedtattoo.com/file/jaloxubib.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/baxefalur.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/31867420308.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4324ed2097cf465c0fa4767037e60e9d/selakikide.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/geperevafuzikoradiwikuri.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/lexagalagedanep.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/88227437707.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210915_CBF6F48B501E470E.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161469a747c024---nuneno.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/fowodanuzoxefu.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/tikebadiburamunin.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/99821271744.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/tojokefirupadumote.pdfIn PDF document text
    • http://suurelepa.ee/data/file/48977862185.pdfIn PDF document text
    • http://vitrine-prof.com/files/xajiwawajemol.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/pigosegiwuzuwika.pdfIn PDF document text
    • https://yifff.se/userfiles/file/sufojadebakomadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=vpn+360+premium+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 20592 bytes
SHA-256: afd8b59e9cda7699b0b974b510448947dee3ec72ab71644bb0627f6e03256018
font_02_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 10604 bytes
SHA-256: 406f6a6596cbe55bfe2e0e4c45689ca06dd5a1ffa31f02d67946d96361d1bd35