Malicious PDF — malware analysis report

Static analysis result for SHA-256 278d19e991bbf3f7…

MALICIOUS

PDF

80.0 KB Created: 2021-03-06 08:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8d123017c3688a95d03b02fce0def869 SHA-1: 2430e9ecc05adbbb74df3f19b024d89ed2e2e028 SHA-256: 278d19e991bbf3f7df5df948b4bdfe228b6d58aede1dd2787219edb2c87182d1
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a redirector to a known malicious domain (dafemum.ru). The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to building trust in virtual teams, suggesting a lure to disguise the malicious links. No scripts were extracted, but the presence of numerous links to potentially disposable hosting and redirectors points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/aws?utm_term=how+to+build+trust+virtual+teams In PDF document text
    • http://pobuzajabazuwu.iblogger.org/61910533000.pdfIn PDF document text
    • http://wusodopepufex.66ghz.com/ketav.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/vibuzelulubibado.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/eeuBCh8/call_of_craft_blocky_tanks_battlefield_5.pdfIn PDF document text
    • http://gajoxuganul.iblogger.org/voyager_legend_uc.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/73UEgi1/58477374356.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/r_language_tutorial_point.pdfIn PDF document text
    • http://podekupe.22web.org/5349507388.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/heihujh/operation_new_earth_support.pdfIn PDF document text
    • http://bigijawiv.scienceontheweb.net/how_much_is_the_new_ccna_exam.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/97490499446.pdfIn PDF document text
    • http://gilogaviteno.iblogger.org/citra_3ds_android_descargar.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/tifuwuw/abiotic_vs_biotic_factors_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/829a75d3-2fd5-4831-8ed9-379f3952ce56/wefuzifolatujosita.pdfIn PDF document text
    • http://pazatirademe.rf.gd/riello_burner_reset_button.pdfIn PDF document text
    • http://miwufojo.epizy.com/bhagat_singh_dj_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16a36845-bdf6-4131-a4bc-fb25576fee89/the_secrets_we_keep_trailer_legendado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c6c7ec9-47b7-4577-8948-e891e59fc1c2/what_was_progressive_education.pdfIn PDF document text
    • http://malinaliwul.epizy.com/real_scientific_calculator_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/fotoluse.pdfIn PDF document text
    • http://ximizadoxa.epizy.com/timebap.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/wimiguratuneminowadul.pdfIn PDF document text
    • http://gatugubebani.epizy.com/22420774444.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/hunger_games_catching_fire_cast_imdb.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_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 5224 bytes
SHA-256: 1255e1a4405f320e9bfd6654fe38534a4c5e11231a228691cc361da2a333912f
font_01_sfnt_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 10388 bytes
SHA-256: c7da09b72770d4d51f0ffa00b3e8589c7f80c28aa2367db27b6c758ea76498db