Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71ec757bae04c63…

MALICIOUS

PDF

66.9 KB Created: 2021-03-27 13:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a259fd1c3b09fe7b08933622b897447c SHA-1: b7a8af5f133a3ba8df3d084c2a00aa14246ff14f SHA-256: b71ec757bae04c63b753a811ccaeaf97ab79cafc062c3a0cae77bb78e9ba07ee
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary URLs, 'https://xezojetit.ru/award?keyword=article+a+an+the+pdf', is flagged as suspicious. ClamAV detection and ML classification strongly indicate malicious intent, specifically classifying it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to an 'article'.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=article+a+an+the+pdf
    • http://wekeb.space/learn_math_fast_worksheets9gaa2.pdf
    • http://legko.travel/service_electric_cable_tv_guide_sparta_njkmp07.pdf
    • http://baltika-trans.com/cheapest_hp_photosmart_5520_ink_cartridgesurby9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_8eff96c7555c4066a21a6d18f55e8c32.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5dc696e3-89d3-4a33-8f4b-42d1ca013b42/piwubevenofugipalikovot.pdf
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_45bf6f6dd44249209c2bf9e8140bdf06.pdf?index=true
    • https://s3.amazonaws.com/numunenoji/mobogenie_android_game.pdf
    • https://uploads.strikinglycdn.com/files/3b52a92c-f58a-4100-a739-34485abb647a/28285925374.pdf
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_acc030988b21405ba69d0c287a47b4cc.pdf?index=true
    • https://f1fb087f-5d49-4061-aa02-230b108315d3.filesusr.com/ugd/645068_0e196843534b4f04b5a67dbec4a5c7d0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/912f1840-f484-40aa-bc09-5ab3f666df54/71016124761.pdf
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_b35842590c0a44f38c2a53b901303ab7.pdf?index=true
    • https://s3.amazonaws.com/pevuwarobuvowa/shrek_2_opening_book.pdf
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_79659a8aceff4d3ab6a2a80b24be1a7f.pdf?index=true
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_9b30bf5655da497d9c004728045247ca.pdf?index=true
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_70866d1aa0014794bf7c52fbab3cf9b6.pdf?index=true
    • https://s3.amazonaws.com/gopuze/46024142151.pdf
    • https://s3.amazonaws.com/vekodupiwarobi/33354418054.pdf
    • https://uploads.strikinglycdn.com/files/64aaaa18-bfd5-48c5-ba46-58a96a51da13/journey_to_the_west_2_movie_in_hindi_download_300mb.pdf
    • https://uploads.strikinglycdn.com/files/e7966bb8-e66e-4db7-a48f-181402a9495f/us_history_regents_review_2020.pdf
    • https://s3.amazonaws.com/jezekemunidup/wigutonekemafoge.pdf
    • 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_off0000cab8.bin
3ca8bd0ddcc5c50b9b68a4655fe96451d5a88b9a3afd670939c5f1d81a80014e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 5056 bytes
font_01_sfnt_off0000dbe7.bin
93ff1ac296f1ffa52bc0b3ac0dc1544a525eb837d1c7a59c33bfab2fd7fb19fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 10164 bytes

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