Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6e4132eb1286ca…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 15:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d85c2e1d2a4169e0de8420a7a252b8ce SHA-1: 653e93da23683fa15d9cf5f1c7fac1f22ded86e5 SHA-256: ef6e4132eb1286caf8a9fc89a9086213f28fe1c6197e5c86f649b9c423a943ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable domains and acting as link farms, suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=android+private+number+call PDF link annotation
    • https://orrizon.ru/images/file/25485061592.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/meberewoxoxozuratan.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/73564880023.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/xigepiwuk.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313206cca6d---penakepogeratev.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/31553180062.pdfIn PDF document text
    • https://123natura.com/stockages/files/88712245059.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/fesiwofetusi.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/gulonunajonulifomubasu.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/mepiwuxalaj.pdfIn PDF document text
    • https://agatanorek.com/files/file/samomiw.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/89203292737.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e90e29040a---nenuwaniwijinezenilipo.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090210442573499.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/jupezukot.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/zaxaxotimanuparakuf.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/momobabekopawiwofov.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/fubikadaligitawefabasuw.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/nizix.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/rabedemizevoja.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210908003805.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/zibuxafezipifamitoboretib.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/gasezopojuwewurepupujivon.pdfIn PDF document text
    • 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_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 18128 bytes
SHA-256: b0966f8368264238205e8167e6a08e13178bb7370fa408ebee007797d0083d45
font_02_sfnt_off00012ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA5 10796 bytes
SHA-256: 2f69e7926c740f384d1e88f5ae9cd8999b8f9181f63d1db11e59923868a06d50

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