Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2fc80ec6444195…

MALICIOUS

PDF

102.0 KB Created: 2021-03-24 01:37:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d29d403377044f8dc3cc404749297570 SHA-1: 58bd75b771ac2deeefaf9c1800b65b32adc37da2 SHA-256: 8b2fc80ec6444195584a1d928f2c1a0084adf65776e3332f38b0e164fc36aa36
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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 https://seumenha.ru/strik?utm_term=hardest+calculus+problems+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377933/normal_604468ab531d9.pdfIn PDF document text
    • http://rulajamizap.getenjoyment.net/programming_in_c_by_ajay_mittal_free_download.pdfIn PDF document text
    • http://kakerusejom.iblogger.org/ipcc_report_2013.pdfIn PDF document text
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/jetupasux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_5fe86161d1291.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489733/normal_5ff2888cdead7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475734/normal_605459c724add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374196/normal_5fe8ef322a3cf.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/maruxov_tusogajovuw_jazaxesoto_kununavixob.pdfIn PDF document text
    • https://zozolunefa.weebly.com/uploads/1/3/5/3/135325744/jowesokifa-zipijuwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382784/normal_5fc87b0550057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413845/normal_5fe796e82559d.pdfIn PDF document text
    • https://nogorixarolixi.weebly.com/uploads/1/3/0/7/130740589/xexaz.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/vewivewelutepuda.pdfIn PDF document text
    • http://xudisoda.66ghz.com/vazinusobulo.pdfIn PDF document text
    • https://xevekefipozi.weebly.com/uploads/1/3/1/4/131406281/e2808abd39.pdfIn PDF document text
    • http://jenewazajasazu.getenjoyment.net/slimming_world_free_foods_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/wokiwilawakakilesatewe.pdfIn PDF document text
    • http://zevomes.rf.gd/all_souls_trilogy_book_1.pdfIn PDF document text
    • http://gumizaxewa.atwebpages.com/zidowemi.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/76879152912.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/epfo_registration_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/tencent_gaming_buddy_emulator_offline.pdfIn PDF document text
    • http://rixibedi.onlinewebshop.net/trueman_s_elementary_biology_download.pdfIn PDF document text
    • http://retetopipazaned.epizy.com/kawedefe.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/north_conway_nh_weather_report.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://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
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12882 5504 bytes
SHA-256: fbe4c9d5607ed04b7daf4ecc782d3346a34f952776b7c6d7e0638bc7fc7c68ba
font_01_sfnt_off00013b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B15 12376 bytes
SHA-256: 37c2db4dd35de8c8a1f6974e8d117f6dcaa6128c233fec7ee29b6e1984b96a42
font_02_sfnt_off0001657a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1657A 16124 bytes
SHA-256: 8d6695225dc3b038b27642a4494180d5ac21b720f74e731b7da772b7987b308f
font_03_sfnt_off00017a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A6A 6068 bytes
SHA-256: ff9cbd7946f30f2b7bbe064772a6115a344c3f976dd6a12c5040da37f7346dc6