Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74bc71598264b0c…

MALICIOUS

PDF

96.1 KB Created: 2021-09-18 13:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1197fded58f8b8bcd3511c83d929d46b SHA-1: bb84ba5e89bcb6c8d9ab399f926f22c4a81e9677 SHA-256: a74bc71598264b0ca5f98f287ab99f7516ca573305ecda673245533e06a88615
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://synerhu.ru/uplcv?utm_term=canon+in+d+major+guitar+tab PDF link annotation
    • http://phunphu.com/userfiles/file/puwutemikaxolo.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/mujibitisamonumivufer.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/jisuzu.pdfIn PDF document text
    • http://irollee.com/userfiles/file/wajulesidatefud.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/xupudazixiduba.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/nepavuvuwanivalesuxawunos.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/75108985200.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/memegazotinemido.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/pumokoniwot.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/70735126919.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/3060245522.pdfIn PDF document text
    • http://garderoba.sk/images/_file/46983381288.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/domodijoxi.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/xudiji.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/36328876226.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210914_031836.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16136ca019d1ad---31236102091.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/46673987163.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/48802346199.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/boreludipojojimakub.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/lapufupezotowamo.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/39037160845.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/91262691482.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/71930785245.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/manibupi.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/98090659384.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/7602422039.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 22540 bytes
SHA-256: 9068e6457244dcca8a0d46dbec37d954786494442f71046854c2810d373c1b4a
font_02_sfnt_off00014312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14312 16340 bytes
SHA-256: f343a2f042c58fbf2a55b111f1fcdef8bd82b2d5f97cd170598b356a04c20119
font_03_sfnt_off0001596a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1596A 10644 bytes
SHA-256: b2c55302d0eb9329d90dc93aab367ba027822aa576420f4d188a09386c37550d