Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ae60d9b5ccaed8…

MALICIOUS

PDF

91.8 KB Created: 2021-03-15 12:58:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb840103a2f8a674a43d175cff5caa7a SHA-1: 73a136f8ed2e6709620749014ab794ee796b5207 SHA-256: 97ae60d9b5ccaed8e8b15972a0dc30a42ef9e9442504dab7e64a5f7a18ae4bb7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to direct users to various external PDFs. One prominent URL, 'https://dafemum.ru/wix?keyword=persepolis+the+bicycle+questions+and+answers', appears to be a lure for phishing or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/wix?keyword=persepolis+the+bicycle+questions+and+answers
    • http://xoxosedefoxadu.mygamesonline.org/60369886201.pdf
    • http://rajajime.mypressonline.com/alfie_kohn_beyond_discipline.pdf
    • http://xafopawiki.medianewsonline.com/what_obd1_and_obd2.pdf
    • http://fofiwafajelerax.sportsontheweb.net/78168675338.pdf
    • http://tokepubex.getenjoyment.net/vofedorunijolot.pdf
    • http://piwulag.sportsontheweb.net/whatsapp_emoji_meaning_in_marathi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tokit/b_i_f_r_full_form.pdf
    • https://uploads.strikinglycdn.com/files/37396c26-5303-4fff-aac6-5c68fb74edf8/ubu_roi_analysis_francais.pdf
    • https://uploads.strikinglycdn.com/files/af51505b-5048-466d-bc5d-5f8d29c75902/30353454340.pdf
    • https://uploads.strikinglycdn.com/files/b48fafb4-990c-4b10-a37b-fb15aa81c67f/71158225806.pdf
    • https://uploads.strikinglycdn.com/files/5d3e0c2f-84a2-4cc8-9776-b243b29ce146/insinkerator_evolution_prestige_installation_instructions.pdf
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_d2f8698d05034d8888b849f19f7283c5.pdf?index=true
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_d4c938c826004f70a7448ad7a69f8e9b.pdf?index=true
    • http://paguxesij.myartsonline.com/87477761178.pdf
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_5adf080ab58d4b8db5d1c07215c5edb7.pdf?index=true
    • http://medexode.atwebpages.com/jaxalemurejax.pdf
    • https://uploads.strikinglycdn.com/files/a3708920-e401-4fb8-af75-bc3b5f6b3ecf/34913159075.pdf
    • https://s3.amazonaws.com/salosibejodod/album_new_song_2019_pagalworld.pdf
    • https://uploads.strikinglycdn.com/files/3589516b-9a4a-4460-a1bb-94a12e3e064f/lexus_nx_300h_f_sport_review_2017.pdf
    • https://uploads.strikinglycdn.com/files/7c5d2cba-82e4-4b9d-90b9-01c3dafcb7b8/98399048832.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_off00012a95.bin
e149c5e9734e44b198a16f019c821f55f92f6cf014d31833ac110f147f23ae88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A95 5624 bytes
font_01_sfnt_off00013db2.bin
0d51a3bb2b11f05cf630fb0b3b89a7edfc5c7961236e51f3fdc9f31396e2db64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB2 10572 bytes

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