Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0515800f707d9c4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 13:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9bd4e6d39d68bbb075333f85bfad06b7 SHA-1: e42273accf5f6a930fff177db5968f5c14a675ed SHA-256: b0515800f707d9c4eeb06ccd30d2028008755296f858d5eea5fa96023ff9b409
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs indicate an attempt to redirect the user to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=how+to+lock+location+services+on+android PDF link annotation
    • http://ajej.pretty-match.com/upload/files/24333445725.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/jidazibataguguramo.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/1469991220.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/vulilaxotezipepuxoxu.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/47195756191.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/78584671430.pdfIn PDF document text
    • http://workontext.ru/media/file/mefukujexatenifowevixega.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/fudegibexuvali.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/dewefibejugusaf.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/4995000293.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/pavij.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/viwokajazarevoxuposizog.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/jifowifefupaxopij.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/40311615507.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/rekag.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/tipuxetepadazodojenoxase.pdfIn PDF document text
    • https://amgaa.org/temp/files/21849114947.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/koxedewibokexifuduzajezi.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/19875445589.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/gusukotupodal.pdfIn PDF document text
    • http://splogservice.ru/content/files/24183939660.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/96857231202.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/64699037481.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/kovuba.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/34087018373.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/5123073841.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_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 16948 bytes
SHA-256: 1f2f11ff46e6e68e1de1be943b60b7c43d0cd55bc597804c6cfe756c3c6e0c77
font_01_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD7 10596 bytes
SHA-256: 1d48300b4f17af6a8e13d257cb0a8e02f757706824c1c82016382e62cd48dd4c