Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce3c60c3764c6f6…

MALICIOUS

PDF

97.7 KB Created: 2021-02-16 21:55:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0029fa8cf923706af91f2df2c4140944 SHA-1: f8e70d7d18f4be6ac6e6cc5cbdc82a36be32684a SHA-256: 8ce3c60c3764c6f6de0a78a88e9b551a77adfa67d5efee051fae4687b6f9d889
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, but the presence of links and heuristic firings like 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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.
  • 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/wix?keyword=run+3+google+sites In PDF document text
    • https://pujezifug.weebly.com/uploads/1/3/0/7/130738771/9305a723.pdfIn PDF document text
    • http://goproonly.com/predicate_nominative_and_predicate_adjective_worksheet_with_answersrwbg2.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/dcjayib/wallpaper_hd_4k_background_download_apk.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/free_scientific_journal_articles_s.pdfIn PDF document text
    • https://junerokiwoji.weebly.com/uploads/1/3/0/7/130775834/14b1d.pdfIn PDF document text
    • http://saudiautoinsurance.com/analog_and_digital_electronics_notes_vtu3nsjn.pdfIn PDF document text
    • http://tersq.space/ubisoft_report_bug_assassin_s_creed_odyssey4n22i.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/RFaSheF/tournament_organizer_discord.pdfIn PDF document text
    • http://rubisteq.online/architectural_design_studiooryxy.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/itwgcF8/38066353774.pdfIn PDF document text
    • http://zathkatow.xyz/vapevunagds0ei.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/lakujusitejojet/bluebeam_3d_navisworks.pdfIn PDF document text
    • http://lulikeleweworup.epizy.com/sql_plus_oracle_11g_free_download.pdfIn PDF document text
    • http://rinikinatupeted.epizy.com/meteorological_satellites.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12127 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off0001311b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311B 4720 bytes
SHA-256: 01e89816d6e495fbf84dd7c6d72bdfaa875f1dd9b671fdc04a493a3c478bd7bb
font_02_sfnt_off0001414a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414A 10276 bytes
SHA-256: 1d103e253be03639ef52a4024a307adf9bb7f070662d449d883b71309ffad70a
font_03_sfnt_off000164b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164B7 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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