Malicious PDF — malware analysis report

Static analysis result for SHA-256 707789207357f2b7…

MALICIOUS

PDF

94.6 KB Created: 2021-01-25 21:09:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a2feef72a15d0d2d699f4a0a70cdbce7 SHA-1: 8e721c1b6e0a7f1a7cd56a80dc4b245401522ca4 SHA-256: 707789207357f2b7a554ecc51c4c41ddcfaab83b3a6ea434c0686056586767d2
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized redirectors and link farms, indicating a phishing or malware distribution scheme. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly suggest this intent. The presence of embedded URLs and the ClamAV detection further support the malicious classification. While no scripts were explicitly extracted, the PDF structure and linked content are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/aws?utm_term=c%252B%252B+11+using+template+function PDF link annotation
    • https://nikubasixuza.weebly.com/uploads/1/3/0/7/130738960/voxigupufu-mifuvixidebuzu-zivagap-nubuporogamiduk.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/gi5ii7t/35685008414.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/hegcQii/asteroid_crashing_into_earth_video.pdfIn PDF document text
    • https://lefusovu.weebly.com/uploads/1/3/4/0/134040443/vasesofipitaxap-zevegobemazi-xinibezareva-doberometupuso.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/ghcfhgL/bafukoduxogabotubirir.pdfIn PDF document text
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/86c3d1e.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/Z0JOZaQ/fovagofavomovapinimij.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/fji2gdP/morajowudapuzobakewuti.pdfIn PDF document text
    • https://cdn.sqhk.co/jokalirubore/bggivij/battles_of_the_american_civil_war_1863.pdfIn PDF document text
    • https://cdn.sqhk.co/lukumuzu/9ijsgiW/semodasitux.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/difJFih/wadegamokuxefelulokabi.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/bkv8Pij/stargazing_bubble_tent_joshua_tree.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/bgc6NtC/space_buster_energylandia.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/Geozjhs/pelogosumomafigizasuku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/guvovigo/cell_cycle_chromatin_formed.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/96022994285.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/bpm_full_form_in_ecg.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/togerazuvera.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/idle_wizard_abolisher_guide.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 6548 bytes
SHA-256: a16d78b4e765d5ee2bbe34147faa0d9708ca9f4bd36cf3b090d8d65c0d41a973
font_01_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 5196 bytes
SHA-256: 37c346216a4a0569f5fda6470ba1b5d6a7f26f3e9e4cab1c1c26dd6032c460e2
font_02_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 3792 bytes
SHA-256: 5bf5666ea36ee304b175e63dd37aa8676a37af5d66a35d0326c836aabe9ba4fb
font_03_sfnt_off00011e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6A 12004 bytes
SHA-256: c4dc23822e8c27539b07bf267f972bd34e01563f689b24f647dc15d9b7866193
font_04_sfnt_off00014722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14722 17460 bytes
SHA-256: d0f92f0d3afd91de2b5d4972e75baf45026a0f2537de5fd6351bb0a346150056
font_05_sfnt_off00015d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D44 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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