Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6490861b0c5d77…

MALICIOUS

PDF

93.3 KB Created: 2021-06-01 05:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 378a7759dc42b79918f34f0e31e0ac57 SHA-1: 5902f77fa31315e6967cdb375fc9bcad5ce6460f SHA-256: 6b6490861b0c5d7726e1d3ce32670de5e93dd0de5f8da8f813f17a8f52eab2d0
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'smidgel.ru', which is likely used to deliver a malicious payload or redirect users to a phishing site. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Libros de preescolar'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://smidgel.ru/pbw?utm_term=libros+de+preescolar+2+sep PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488807/normal_606b65fb4a44b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_601c9433de0ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413719/normal_605afcb404c5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_600d5d2be6b5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384143/normal_604b87adb3e8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_60608d91a693a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420430/normal_5fd19c5dce20f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392864/normal_600f5f79489ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466680/normal_601981f644a03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482405/normal_6033993b6e569.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae2dafa7-4210-448a-aa95-737629964c0f/xobojaxazus.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/deciduous_forest_biome_abiotic_factors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca21f02-1810-4988-9192-dd11bb32da84/21407655741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dae35d3-b4c1-41e2-95fc-c6df2e2005a2/stihl_bg_55_blower_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716497f8-a731-427e-827f-1f5117234957/2013_dodge_charger_front_bumper_conversion.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/w/file/fetch/144441525/qcm_sur_la_rvolution_franaise_4me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/883b0c60-f6a9-41fb-87d2-5d02301f33c3/how_to_change_ink_on_sharp_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c76a0a26-2fa6-4e06-a426-c3541ed4a494/werewolf_online_mod_apk_unlimited_gems.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/how_many_pounds_of_feed_to_raise_a_pig.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/f/63239158470.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_off00012c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C20 5280 bytes
SHA-256: 5825757c5fbdecdd5ccb33b1175b1a47c6fb2e92c526e46a4ec4a39645cac4a2
font_01_sfnt_off00013e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1A 12668 bytes
SHA-256: 3b9bd3acbfb250b83e8c2b8bf11c43964d0db5cdd424e94573b5cb6b26cfeda1

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