Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bc67c2894043a0…

MALICIOUS

PDF

93.2 KB Created: 2021-04-06 12:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05b18a74b8284748e6a4b230c25553ca SHA-1: 250c564c01d82f39342a6a65b39920a8c47cf19a SHA-256: d5bc67c2894043a02d48d3ef5779e1500b505aedd496558f9ae04f95c34b8482
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to critical thinking principles to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=what+are+the+basic+principles+of+critical+thinking+and+how+can+they+be+used+in+everyday+life
    • http://msertis.xyz/how_hard_is_the_florida_real_estate_broker_exambfj4r.pdf
    • http://tersq.fun/dagabotapaxufireroleriq9s.pdf
    • http://setofexperience.site/87392948475hgrv0.pdf
    • http://testrun.ru/geraldton_police_reportsavet.pdf
    • http://thecaffeinatedstudent.com/who_are_the_three_main_characters_in_war_and_peacecir20.pdf
    • http://segway-wheelchair.ru/utility_software2crpt.pdf
    • http://volosaty100.xyz/crazy_train_flute_sheet_musicxyfxr.pdf
    • http://pifedalune.medianewsonline.com/pabugilag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wanasuvedigo/16547413428.pdf
    • https://84bc2af4-305a-40b7-847c-8c52cb6b08d2.filesusr.com/ugd/a2e525_1f8a2829fbe54a83936387fa08001352.pdf?index=true
    • https://s3.amazonaws.com/vefagotoje/que_significa_circuncisin_en_la_biblia_reina_valera.pdf
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_e95948727c614b9d9448d40aca303aa5.pdf?index=true
    • https://s3.amazonaws.com/wifiduxezo/android_action_bar_overflow_icon.pdf
    • http://zijiwaras.onlinewebshop.net/university_assignment_format.pdf
    • http://vubelifijam.atwebpages.com/craftsman_18_hp_ohv_intek_oil_change.pdf
    • https://s3.amazonaws.com/sowewazulejewi/how_to_construct_a_velocity_vs_time_graph.pdf
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_de7af107db29483bb4d6dbf90cd08adc.pdf?index=true
    • https://s3.amazonaws.com/fajixe/26763999333.pdf
    • https://s3.amazonaws.com/bokofapig/fixawozidatiroruxiw.pdf
    • https://s3.amazonaws.com/gazitif/onn_bluetooth_earpiece_manual.pdf
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_f7bdedfecf904d7fa1779ed0ced09c96.pdf?index=true
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_162d08f8594b496b86c15273eb9139b4.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bc0.bin
7fa12018177887f24c2b0874e63ec7ced057bba7bdbc72d3e9c5976c05f11927		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC0 5888 bytes
font_01_sfnt_off00013fe7.bin
87a84682276571aa1455432f1be2faf978f2bbdfde2f0b88736c0391ca4374a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE7 10612 bytes

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