Malicious PDF — malware analysis report

Static analysis result for SHA-256 683a9baa97b3cd4f…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 03:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5899191ddb0d923497cc1eab841154f2 SHA-1: c374aa64d609e0a4427ed832fb99d9cb920dc093 SHA-256: 683a9baa97b3cd4fb69da71a85fba7bce28807eccd308d81e154d46083f6fa02
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=12+bio+zoology+book PDF link annotation
    • http://qqwandai.com/uploadfile/file/xolazig.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210904_428DDCA2D2119089.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/wutomozezuwef.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/bupumesas.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/88326609195.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210909062428284361.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/kirobigewebexodeveselule.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/rikepovawuzoka.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/78963030161.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/67145145065.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/78036611635.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d600bf9e---sewobinujezafafijidupo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614272da1e6ee---50061602555.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/zazideminid.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/44127728387.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219211538192662.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/80914484897.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/99775418645.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/52888639699.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/52200876550.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/vibusixugesaj.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/kavafe.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/77378940273.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/japogosid.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/ximamaluxovoxasekoruji.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_off0000b381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 15096 bytes
SHA-256: a1dffaa791e6120646bf40c12786c656ebb763080264ad82559c9569125147a5
font_02_sfnt_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 10000 bytes
SHA-256: 20a05ebe2fd5f1446b54f16b36e7c23343ad4a8fdf1afda79b267d5128ad33c1