Malicious PDF — malware analysis report

Static analysis result for SHA-256 889e2c368495290c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-10 13:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3fa2a9e31620ad6c22f2b6454646dc67 SHA-1: da8f564b559070c29880329c281e85c68f8bac7b SHA-256: 889e2c368495290ca466ff0d2dfa3715d0474c74b0300c0dc23f7d4592abea19
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm or distribution point for further malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://napraforgohotel.hu/upload/file/gororulinimopapo.pdf In PDF document text
    • https://mtestbd.com/assets/uploads/files/45733032441.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/47117747116.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210901_A3B192FC19295741.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/42006847161.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/67330012942.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/31301451372.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/jiwutinijeribolebawixe.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/10344962431.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210905021756.pdfIn PDF document text
    • http://abriganature.centralcms.cloud/galeria/files/5072510124.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/netemuvexagevo.pdfIn PDF document text
    • http://drironcat.com/images/file/kazutopawoguvedufex.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/semesubepanukilabu.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/wizekijamobirizaxuka.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/78799041498.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/kupenavudujelax.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/rulufesitexivafarab.pdfIn PDF document text
    • http://azizolace.cz/images/file/tufedukuzozolexafafujixo.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/53726979056.pdfIn PDF document text
    • https://rajaunited.com/contents/files/gisada.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161387a188a74e---vefajipi.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/pevogegelixuvesomux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=schaum%27s+outline+of+engineering+mechanics+dynamicsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64C 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_01_sfnt_off0000cf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 11244 bytes
SHA-256: 4338e16bcd074191efa03bab4b4b646d08be1d7274ce8eee13e0ecc0d768e13a
font_03_sfnt_off00010122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 20652 bytes
SHA-256: de3057e99bfe5c4f9cbe06a7ce330d72e6ed4097bd3003537f36726628d3a774