Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7dc16ae4cc2e31…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 20:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6ab014ca6af1a7101d3d5213e07da10e SHA-1: 7cf850feeacb0cbea305550e3bc5fd0079ab9750 SHA-256: 8a7dc16ae4cc2e31965661dfc84958a00fb9126dff31d852afa60e33c88d2afa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The PDF's structure and embedded URIs suggest it is used to lure victims to potentially malicious websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://philabc.ru/uplcv?utm_term=earthworm+jim+n64+rom PDF link annotation
    • http://campfirewtx.org/userfiles/file/90917197989.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/86515740062.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/31592370770.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/milidolizawupuwij.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/20605370018.pdfIn PDF document text
    • http://ahknchem.com/upload/files/bixalabupakafefuvudadadem.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/75762852930.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/mugefevemerobogevanukex.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8c07b9dee---topenadu.pdfIn PDF document text
    • http://juentai.com/userfiles/files/kuwum.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/metabojuneru.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gejumisifovabogipi.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/42695403458.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/93847355307.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/jajopokulavenota.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/31045742040.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/duwisosujijapujaxavetokix.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-19/images/files/32125996582.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/samifineta.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/ritupobiwefu.pdfIn PDF document text
    • http://serting.eu/userfiles/files/3137041733.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/73566793378.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/86915427586.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/mepiluta.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/89039050387.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/komibatunepeginigexi.pdfIn PDF document text
    • http://boldogelet.hu/media/7446244598.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_off0000b1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A6 10472 bytes
SHA-256: 4f44b9169993e6475d932800b00a88b625513cd351abaa93f34dcbaa59fd1315
font_01_sfnt_off0000c949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC949 14784 bytes
SHA-256: dacd32d6a36862e3a364c142ccb97ad8b03a9f0255b295710e4060733eefca1b
font_02_sfnt_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1