Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c1f6bc0b7d7588…

MALICIOUS

PDF

87.7 KB Created: 2021-05-20 13:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 60c27c29d18124f9df3001ff4db33d5f SHA-1: c1c34cb82330d37e856288b145cdc1e8cf144e93 SHA-256: 63c1f6bc0b7d75881043bf1f59f065b2c0d106d76ebddc1a1d2a06929f6eac7a
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model also indicated maliciousness. The document contains a link disguised as a free download or quotation, which redirects to the malicious URL 'https://jumiwimov.ru/strik?utm_term=test+horloge+cotation+sur+7'. This URL is likely used to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/strik?utm_term=test+horloge+cotation+sur+7 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408983/normal_601e025114d9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497348/normal_600927c0982c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427104/normal_601df85f33720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408991/normal_6021caa4d9283.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379038/normal_5ff8b1ddb0eff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/mutirexa/siriusxm_satellite_radio_stratus_7_boombox_bundle_review.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/sisinuvareroweluvaraxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f032038-0cfc-4810-87b3-5d4f1cbd11c2/how_to_draw_a_nose_for_beginners_step_by_step.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/battle_house_full_movie_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/busutofibavunoxadefox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd953a0-beba-499d-9c52-edfa0ea601c4/75532021406.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/47532527951.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/kindle_d00901_price.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/brazil_amazon_river_information_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/d_t_c_p_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff75bb5-5c30-47b5-a460-d786484536fa/blue_jackets_manual_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/54559574251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5b867a-1394-4990-acb5-dbcce85213a7/ropopoziveti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff92e131-0288-4c0a-87c1-f0baef6826f6/core_java_interview_questions_for_3_years_experience.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86934dc-308d-4771-9f2a-ab4ed5f87fa1/xinafusixado.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/columbus_clippers_schedule_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9054d22e-3450-4087-accb-c058169e0387/notifazalok.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/rufexunukibereresekonig.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 5092 bytes
SHA-256: f9e6fe3ebe7dec1d02de6b8a7bd6c06f68d72f821f227f0815d8cbdbdea73cee
font_01_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 12104 bytes
SHA-256: 452622dbf6550e1d2ffb8931dea13ca9f8b25f0dcb8ce5e846e23179653637b2
font_02_sfnt_off00013006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13006 16232 bytes
SHA-256: 8d7df250e516e515b4d9164ab2d359ce5e1c65354964ae74f0b303d2be5e5a42
font_03_sfnt_off0001459d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459D 2752 bytes
SHA-256: e91e5ed774118e394b1b2e1127f4f46eaa9a0832840f1fce1a875413dfa5fc03

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