Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3a7bebdcc7016d…

MALICIOUS

PDF

75.6 KB Created: 2021-03-24 07:04:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f66c9bc4da881f5511bec6f1e6417c9 SHA-1: b07cde57ec5558df5f0e7e9f40f7d36ff7ddc875 SHA-256: ce3a7bebdcc7016dd3714a0e94dd028a7dbcf6ae04da5dade5142105685bc6fb
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are to other PDFs, suggesting a link farm for SEO or phishing purposes. The primary URL, https://jumiwimov.ru/strik?utm_term=english+literature+books+for+university+students, is likely a lure to distribute malware. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=english+literature+books+for+university+students
    • https://cdn.sqhk.co/rijomawonuj/HNBQsjf/15514900533.pdf
    • https://cdn-cms.f-static.net/uploads/4498834/normal_6036540af1a57.pdf
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/niligaxegur-najoludot-gapazax-rifumesawifu.pdf
    • https://cdn.sqhk.co/gasidonoda/giHLwSQ/pizukirejeferiwesesisum.pdf
    • https://cdn.sqhk.co/luzigagoguna/djfVpgg/coin_drop_laundry_hack.pdf
    • https://cdn-cms.f-static.net/uploads/4390680/normal_601caa7261f41.pdf
    • https://ravojinukof.weebly.com/uploads/1/3/4/4/134476618/8349797.pdf
    • https://fewojejano.weebly.com/uploads/1/3/4/3/134348079/mefazunakaf.pdf
    • https://fuzifilagowiw.weebly.com/uploads/1/3/4/6/134698760/dizigep.pdf
    • http://topsol.xyz/tipos_de_graficas_de_ecuaciones_cuadraticas43tdh.pdf
    • https://vidapuromojesa.weebly.com/uploads/1/3/4/8/134890941/4710188.pdf
    • http://copyrightsupport-ig.com/what_does_this_emoji_mean__from_a_guyvjjkt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f1fb087f-5d49-4061-aa02-230b108315d3.filesusr.com/ugd/645068_7de4bcf0211f40688d0c6c167ad7986c.pdf?index=true
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_732ee642af3f4c6eb762d8e1275d12bc.pdf?index=true
    • https://s3.amazonaws.com/sowirutelevolur/angular_static_variable_in_template.pdf
    • https://s3.amazonaws.com/goneduzum/2016_cbr650f_manual.pdf
    • https://s3.amazonaws.com/buponuwebi/reverse_phase_high_performance_liquid_chromatography.pdf
    • https://s3.amazonaws.com/rowubunak/all_in_one_printer_reviews_consumer_reports.pdf
    • https://s3.amazonaws.com/zaxuledo/cnet_antivirus_for_android.pdf
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_14392cb1b7de481f9c68e0b7fe67d087.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_off0000e6b1.bin
05ae1b5bad19d52ad751a6a2c3648578a1cc2dd81a7cfa68dde5e38bd0efcb91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 5492 bytes
font_01_sfnt_off0000f96c.bin
c1439656449d1218a482d152463474284e2ff12e55af8d967dba5d0d0977b821		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 11744 bytes

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