Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c13f1c5888b1432…

MALICIOUS

PDF

79.4 KB Created: 2021-02-13 16:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 881fa2c4303c82c634659c016c1efe56 SHA-1: cd05743da3b0be3f071091e2da8773195a80334a SHA-256: 6c13f1c5888b1432d2ef7373a0f7a9a9ca8a22ad446806e4cfac5cb8c151957f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm or SEO poisoning attempt. The primary malicious URL, https://jottigo.ru/123, is presented with a query parameter related to a modded application, indicating a lure to a potentially malicious download or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/123?utm_term=wwe+champions+mod+apk+unlimited+everything+latest+version PDF link annotation
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/lezilisod-sumogajavaf-figuvatobagun.pdfIn PDF document text
    • https://levavepisemewo.weebly.com/uploads/1/3/5/3/135303450/bujaber.pdfIn PDF document text
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/8534ca8b7.pdfIn PDF document text
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/8255156.pdfIn PDF document text
    • https://gapidekejoz.weebly.com/uploads/1/3/4/8/134876705/7684899.pdfIn PDF document text
    • http://xadojewivo.iblogger.org/girozukowub.pdfIn PDF document text
    • https://tadinitalu.weebly.com/uploads/1/3/4/7/134744808/lonesilapikuxetotir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xadiromawa.epizy.com/10916665019.pdfIn PDF document text
    • http://xewaxal.epizy.com/multiplayer_chess_app_ios_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/lixujolafizij.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/industrial_gearbox_types.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/73685515324.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/pillars_of_eternity_poradnik.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/vokaburevikewativopokizu.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/broken_hearted_girl_piano_sheet_music.pdfIn PDF document text
    • http://zefabuvo.rf.gd/journal_editorial_report_9_14_19.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/91317423539.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/kurobafalonakusupewiguso.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://scripts.sil.org/OFLIn 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_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 5820 bytes
SHA-256: 2e6f59491ed00892214024aed61471ee8464a815352801ca36c2234e29c6cdd7
font_01_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 10888 bytes
SHA-256: 4eafdfa49c5d302fcbed36f7699a63ff99d0d7c5cdbde7abc6ff272057d10965
font_02_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140

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