Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8258e0f22258757…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 06:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b24f5518fcca2da43f36255f322bdab1 SHA-1: 04da7e8bb4ef71c5a450f2c7ba328e40dbba8aa7 SHA-256: d8258e0f222587575ba087f8444568827996c2c5b2d799e7b4d46b63958bb7ca
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

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://krisoc.ru/uplcv?utm_term=apktool+decompile+apk PDF link annotation
    • http://pekingtogo.com/uploads/files/bogamomojefupijuru.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/48448330381.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/56417564736.pdfIn PDF document text
    • http://104408017.linker.tw/files/57902247920.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/kanukajitavowudeginuwuk.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/90977749333.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/wepofid.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210912023122.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/42154507483.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/16235409198.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/76394448785.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/giredegutegevowodiloguxuf.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/xoxor.pdfIn PDF document text
    • http://allier-genealogie.org/File:/jofib.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/delurulexex.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210924022116.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/xujawaje.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/41293619147.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/fimipuxepenatenujuraxi.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/27359000721.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/jimeke.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/8639219417.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/gezatojurugabozoxufifa.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_off0000adb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C9 16208 bytes
SHA-256: b29846e8e893f1f3ef1cf0f59f157e373a2e7eb2608134ff0a918b9d4f1119c2
font_02_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 10376 bytes
SHA-256: 774f8f5de1858180e1842288e2e4b395347f8a243101595c59ceae544d271bf3

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