Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd5bd4569eb7e08…

MALICIOUS

PDF

80.6 KB Created: 2021-03-22 03:57:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e69ba0c17dc5e41b53cfa94d695d9b21 SHA-1: b6633ce1ace99c848ec27888a4cd684da0d722f0 SHA-256: bfd5bd4569eb7e08c0c6ad5f1ef27f55d89b6b019243599fc428cf6ee7c661eb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to SEO-optimized PDF farms, suggesting an attempt to manipulate search results or distribute malicious content. One prominent URL, 'https://midufefew.ru/wix?keyword=liquid+thermometer+for+baking', is directly embedded and likely serves as the primary lure. ClamAV detection and ML classification strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/wix?keyword=liquid+thermometer+for+baking
    • https://cdn-cms.f-static.net/uploads/4384634/normal_605640bd2ea9d.pdf
    • http://vutanari.22web.org/comparing_fractions_to_decimals_worksheet.pdf
    • https://static.s123-cdn-static.com/uploads/4409411/normal_6004a2d8a6fa0.pdf
    • http://degitowexara.iblogger.org/whirlpool_quiet_partner_iii_normal_and_cancel_light_flashing.pdf
    • https://bifitulodagox.weebly.com/uploads/1/3/6/0/136081839/9266339.pdf
    • https://kumapeforurimo.weebly.com/uploads/1/3/4/6/134664671/rimiwokigav-gegilujufirener-veperewo.pdf
    • https://cdn-cms.f-static.net/uploads/4411932/normal_604ce8413f83f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gezejoputiwinu/free_incident_report_form_template_word.pdf
    • https://s3.amazonaws.com/dubiditiginowo/87190256573.pdf
    • https://s3.amazonaws.com/mevuzokekenojab/befoxukepepaguro.pdf
    • http://witigunakejawi.rf.gd/67253484998.pdf
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_c4b23e9c9bb4431ebadb59f2dd4caf83.pdf?index=true
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_0f7296d66b1f490ba71d4de1d8ef6cdd.pdf?index=true
    • https://s3.amazonaws.com/lukepepe/vejononitonu.pdf
    • https://s3.amazonaws.com/zamuriza/banished_1._0._7_mods.pdf
    • https://s3.amazonaws.com/nupotukig/system_administrator_interview_questions_and_answers.pdf
    • https://s3.amazonaws.com/zuguvoxoki/book_of_assistance_arabic.pdf
    • http://patazave.epizy.com/gospel_in_the_stars_book.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_7f6dd4bde4aa4e5192db4a90ec850259.pdf?index=true
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_d9fd95121e8743829578a987dc041cca.pdf?index=true
    • https://s3.amazonaws.com/wutisigila/xidugugikilekezabevuka.pdf
    • http://parepakikil.epizy.com/32253955791.pdf
    • https://s3.amazonaws.com/lizuseguwix/95901685707.pdf
    • https://s3.amazonaws.com/tazopaju/92691079882.pdf
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_a2896206d43245f6b9cd884e057dd5d0.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_off0000fcf7.bin
02f62b7c738d43433b2167f2baaa3638a2694270a486af8ee2b247b8caca1712		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 5384 bytes
font_01_sfnt_off00010f1b.bin
bd7652a1eef228f3fd3a26b1c3e148e970367fd2d7c879be50c50a391d3ce016		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1B 10612 bytes

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