Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b750c9d96c416a…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 22:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01b3f0ff9c6d0af6ab7949603cb66712 SHA-1: 8aee3e491c2adecd80d4580836ce840efb313a65 SHA-256: b8b750c9d96c416a3c86b022bd369ff7a706c763dec898ec92a0b5ec2ce1d1f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=hearts+of+iron+4+download+android PDF link annotation
    • https://www.abrasco.org.br/ckfinder/userfiles/files/lazipin.pdfIn PDF document text
    • http://ustunongel.com/image/files/77601903013.pdfIn PDF document text
    • http://4darchitecture.org/img/all/gewirojuxu.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/55025445513.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/31731930222.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109241832166845.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/gukenivilozaseju.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/rejaledewanujozuwidit.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/benidejinokisumodatixara.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/63988039268.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/31058949945.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/68476840719.pdfIn PDF document text
    • http://gerocuki.hu/user/file/lunovekikaro.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7627e09e7---40114945588.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/60326480076.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/38645389282.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/26180393110.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5d6cd63722ae85abbd28bc7a584d64a0/42705189170.pdfIn PDF document text
    • http://jvmont.eu/userfiles/file/66498506043.pdfIn PDF document text
    • http://etre-belle.su/images/file/suzefitulopepapaxek.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/xukalixizegakoleraredaz.pdfIn PDF document text
    • http://boxethai38.com/upload/file/57517655552.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/99777451681.pdfIn PDF document text
    • https://abss.pt/userfiles/file/xamabizoxufon.pdfIn PDF document text
    • http://synphabase.ch/upload/file/79423347106.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_off0000af2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73C 14520 bytes
SHA-256: 1e90fd88a6e59c8bdae0a7a63c92e123773b24dd6da01cea0cfa7074e342e1be
font_02_sfnt_off0000eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 10504 bytes
SHA-256: 25c1237131e87d3e9ce3ddcee736bee37d0531e3af44070e8c49c319cdb6df12

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