Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28e8b4895423a1e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 04:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29a7b901842630bb600a7ad9da075283 SHA-1: e6c3de88bf2689042b553a05eb9e238ed92c3be2 SHA-256: d28e8b4895423a1eded07c7beb420adbe799dbcd9f88fe7727c1d64299368660
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=k+means+for+text+classification PDF link annotation
    • http://e68momo.com/shopadmin/upload/files/ribazitovimugesugut.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/julupaginezaragov.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-20/20210920011802918586.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/29551128530.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/12260126009.pdfIn PDF document text
    • https://ka-base.no/images_students/files/deruj.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614008e68c4c9---didatetamopipobosipimobor.pdfIn PDF document text
    • http://grossbuch.com/upload/file/61624416687.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/14589010531.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///nigotizosilopufatipodafo.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/67734812407.pdfIn PDF document text
    • http://lecostationery.com/files/file/vosamikorojowinepobosesa.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/fenilisofapil.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/vewugiduzeramiwonix.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/68109210149.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/jejojadikefisipe.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/zinulifojosisisibodotun.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/95928515382.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/nujagadojupibozolitaz.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/92109243890.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210921053238_1246464159.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/2571823155.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/96323581913.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_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 10592 bytes
SHA-256: 1e99ebeb712725b4ed081b71eae0a55fbbb187fc95825aaedd61066d226232f4
font_01_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 18212 bytes
SHA-256: 3e54c56f197525a664649edec28dfa4aa85fdd2c24e347152f192aa700b3478c