Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b522efe6033afdd…

MALICIOUS

PDF

72.1 KB Created: 2021-03-23 06:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d45e4bf8afdad5b6bb205c309c02a927 SHA-1: db80bdbd1efc0e488844f317949784b65aa40d02 SHA-256: 3b522efe6033afdd729a582809f6d1f6d8563ffec6537bea8579856d04520fdb
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm for SEO manipulation or phishing. One critical heuristic identified a link to a known malicious redirector at 'https://dafemum.ru/award?keyword=bicycle+repair+manual+pdf+download'. The ML classifier and ClamAV also flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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 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.
  • 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://dafemum.ru/award?keyword=bicycle+repair+manual+pdf+download In PDF document text
    • http://rurojewof.22web.org/12504114692.pdfIn PDF document text
    • https://cdn.sqhk.co/widiroje/jehiidH/alesis_dm5_setup_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/UhVja9I/call_of_duty_companion_app_leave_squad.pdfIn PDF document text
    • https://moviwinexanasi.weebly.com/uploads/1/3/4/3/134314602/27dbd60bb0c8.pdfIn PDF document text
    • http://xepezugabiposa.22web.org/how_to_get_a_hardship_drivers_license_in_arkansas.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/voxelebifixe.pdfIn PDF document text
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/xasuma-junigizi-wokaseze.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/jggigjM/screen_time_control_app_for_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/fajaleniwa/ijkhhhf/6368285470.pdfIn PDF document text
    • https://bizitodavil.weebly.com/uploads/1/3/4/3/134321392/9943417.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pilojoduzige.epizy.com/55272899131.pdfIn PDF document text
    • http://maderenefozido.rf.gd/72891671974.pdfIn PDF document text
    • https://a3c73713-be4b-4c8d-a01f-dab92ecb4e1a.filesusr.com/ugd/5df860_2f8b0a25f9264e53b5cc379e18b51364.pdf?index=trueIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_08ad2aa7535f4881b7af0fb6cfab5a17.pdf?index=trueIn PDF document text
    • http://rugeminawa.epizy.com/dipulukojugep.pdfIn PDF document text
    • http://dejujerun.rf.gd/sutebabinukeboxib.pdfIn PDF document text
    • http://batuzotunar.rf.gd/skitarii_codex.pdfIn PDF document text
    • http://jibovofafef.epizy.com/53116783729.pdfIn PDF document text
    • http://zafediluxewo.rf.gd/final_cut_pro_x_trial_crack_mac_el_capitan.pdfIn PDF document text
    • http://wevosana.rf.gd/bridge_over_troubled_water_sheet_music.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_84d2bc4006c7432faa2f46a59f372447.pdf?index=trueIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_4efa321dbad24591a7d5e8b408f2d607.pdf?index=trueIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_e044b168f28647c7a587a77d28b96e73.pdf?index=trueIn PDF document text
    • http://gugogedufos.epizy.com/balarama_2020_download.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 5368 bytes
SHA-256: 33d07c25dc9fcafdc267adf8a937de52f726fb76734d14d7d937df46d3e68af6
font_01_sfnt_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 10640 bytes
SHA-256: 5804603326ca30e450a4ac9275ecce0939fab13a8dd411dafbbe60f455f32526