Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc25140410e74edc…

MALICIOUS

PDF

78.7 KB Created: 2021-09-09 03:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2662bc8e216dd4d04e4a4bea0f7faa87 SHA-1: 123f5aea4baaa2c023b59f7e043d1e925d3ea604 SHA-256: bc25140410e74edc226909faaa83a5b3f4c6090d8e5d397fcb8283e1bf454ab8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, likely intended to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161320fb050658---fiwigepomepap.pdf In PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/20773391076.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/pukoliwiles.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/54851cb97d71377845348b7031c4feee/wulutigixuvubuda.pdfIn PDF document text
    • http://scsychem.com/upload/files/50567963458.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/juroxudawi.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/gegemaremafubifefafaloxi.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///sujivedepejuwo.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/90677705980.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/lutegipolumobazegir.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/turajov.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/fuzir.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/6549245921.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/dagekumaze.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/tejega.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/kuwemovetijopudububixa.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/waweto.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/22760176104.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/33632278943.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/voduloge.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/44869732752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+do+i+clear+history+on+my+androidPDF link annotation
    • 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_off0000d28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 10828 bytes
SHA-256: c23d63551c5886b2c74ce351f7ce4932d846aca5ce9e55b3a5df8d3bbc75bdfb
font_01_sfnt_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 16296 bytes
SHA-256: 5a7539343f8dde3088569cb27f43275765c31e97da5996e7c9ed1f61b73513d3
font_02_sfnt_off00011583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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