Malicious PDF — malware analysis report

Static analysis result for SHA-256 20aa9c34f92c2a27…

MALICIOUS

PDF

208.0 KB Created: 2021-02-25 22:33:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5ce123ee85165eb55dcbb810e4ce0b7b SHA-1: 4963a8c1b8ad89347d8791509009477c1f998b01 SHA-256: 20aa9c34f92c2a27449681f362abf280986a6fa6eadcce81200d9f6472b21d16
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://yafferge.ru/strik?utm_term=historical+development+of+the+concept+of+life+essay'. This URL is likely used to phish for user credentials. The ML classifier also flagged the PDF with a high probability of being malicious. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=historical+development+of+the+concept+of+life+essay In PDF document text
    • http://midikakuvekume.mywebcommunity.org/pedekokitijuwugin.pdfIn PDF document text
    • http://xisajole.iblogger.org/london_stock_exchange_plc_annual_report.pdfIn PDF document text
    • http://perevod24-card2card.site/advertising_creative_strategy_copy_and_design_4th_edition7p25a.pdfIn PDF document text
    • http://stopnutristrike.ru/ncaa_division_2_football_ratingsgpefu.pdfIn PDF document text
    • http://radasekot.iblogger.org/free_affidavit_form_qld.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/51838047716.pdfIn PDF document text
    • http://buytoday.cc/zufigudajatqyjzk.pdfIn PDF document text
    • http://lajibodomemebev.66ghz.com/bet365_app_free_ios.pdfIn PDF document text
    • https://wiwanozamo.weebly.com/uploads/1/3/4/3/134306351/8b0b29.pdfIn PDF document text
    • http://lazezubeb.22web.org/agile_software_engineering_process.pdfIn PDF document text
    • http://salearea.pro/256441026409a7q5.pdfIn PDF document text
    • http://petersikdar.com/cdma_full_form_in_managementy61en.pdfIn PDF document text
    • http://reduslimitaly-official.site/kakuxadolelulotebuvivt4oze.pdfIn PDF document text
    • https://ketevifut.weebly.com/uploads/1/3/1/4/131453005/3107402.pdfIn PDF document text
    • http://mists.space/genuzetozotuzogiguseribosfuxip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xaramoturowuf.rf.gd/dotusovibirumejelezaxe.pdfIn PDF document text
    • http://biduxefu.rf.gd/92571193036.pdfIn PDF document text
    • http://ditiruvovuluka.epizy.com/danganronpa_2_5th_class_trial_answers.pdfIn PDF document text
    • http://vesijugi.epizy.com/wewozewi.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002bb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BB0C 6500 bytes
SHA-256: 1b3afb5dc8d15c4064ce8c4487f33ae88a40fc73fbe974b970ce216cc92458cf
font_01_sfnt_off0002cb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CB40 5520 bytes
SHA-256: d06dd07c8f7ebcabbeb3f568e58241c37694c59ce51c5c9baed3a20a8b54e0b8
font_02_sfnt_off0002dde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DDE7 14364 bytes
SHA-256: 33185a3d1d6f0fe718deed556b6ccd30ffbb785f8e0ac278e4a76b24fcefc1d4
font_03_sfnt_off00030b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B8F 16084 bytes
SHA-256: 0151570569594d5a5ccfeb908d198120a09f680d577f0f73a04dfc340564097a
font_04_sfnt_off0003203e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3203E 6408 bytes
SHA-256: 55a935fe2d4b53cde7f7fc837073d94a7b60e8716fcd04780d42446fc6cd3c28