Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c45d920ba3a1ba…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 08:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20d417423c433c92b486bca1f84bcb15 SHA-1: 44c1a9a9cd163e0f49d2bd78ef0027850c300edc SHA-256: 14c45d920ba3a1ba5eb26a12d9551831a7a7c21ac480e571ee5359f9686253ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, but the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=android+icon+mockup PDF link annotation
    • https://sts-cct.com/app/webroot/userfiles/files/84098984477.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/fikazutevapuxezamajo.pdfIn PDF document text
    • https://aashianarealty.com/file/85715445882.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/42316506653.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/xugojemekufalevamus.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/posav.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/nevapedogabili.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136249e4f13c---gevetiwetumeb.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///74490435323.pdfIn PDF document text
    • http://ecole.ru/text/images/file/83298733378.pdfIn PDF document text
    • https://denimder.org/resimler/files/dusikoxujagomatefu.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/lalososove.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/38482835383.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/gujufunowipapemukefeni.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/zewoxupamozijaz.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-9/20210909064905809774.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/8762529425.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091813054867.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/6017617951.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/kavag.pdfIn PDF document text
    • https://matrixx.lu/images/tokelipaduvovu.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/tavidunutofupemin.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/9225736199.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_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 10240 bytes
SHA-256: b8b7fe29514cd45cee75c4af1e5819c8ca44b3423ecfc92a9339650650bbddc2
font_02_sfnt_off00010d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 17748 bytes
SHA-256: 729ad0c5e7419279b124836e35c43b6d43a16797985fc482e9409a1108bea05a