Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6624f4733f7a1e7…

MALICIOUS

PDF

83.7 KB Created: 2021-09-10 14:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab6e841bcc5a20428629f3db3c57bf20 SHA-1: 9f65aa3d3c887ce9ff6779aef15287088b335c5a SHA-256: d6624f4733f7a1e7387def7a7cd0c84b371ab8ca1b2996f371d2f879c9774380
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also acts as a link farm, hosting numerous external URIs, many of which are hosted on potentially disposable domains. The presence of urgency lures further suggests a phishing or malware distribution attempt. The embedded JavaScript is likely responsible for redirecting the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=notisave+apk+pro PDF link annotation
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/ludixer.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70934728814.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e07c2d03e48be2c2ea3a53ab4379a9ea/68145318816.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/21479666176.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/2709204606.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/wituku.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/bawexamupob.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/97966826431.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/2549477880.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/nojuxez.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613272f5371b1---rozudavegigafatuluf.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/tozonexifuwopafasor.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/8530412336.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/mitosedozilo.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/68892902541.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/zenomonufatixisatije.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/depozap.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/juvukasidoxo.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/42103699641.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/10462614750.pdfIn PDF document text
    • http://intersonik.eu/upload/files/wuputekatoguzubix.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/54070630959.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_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF889 19096 bytes
SHA-256: 0dcc7678960e922212fc8be8c4aa30562ceff383f66d5e5830d0c2246adb6586
font_02_sfnt_off00012ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB3 10228 bytes
SHA-256: 50f6e63e4d934bcf469ebd51b15394838a22a8a966ac41eabba79d690de25f60