Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd86e321631a97f…

MALICIOUS

PDF

80.6 KB Created: 2021-03-13 23:22:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 012134095c4c288eaa38332503cae2e3 SHA-1: b18539c3b642c3d05aa6923ff5f8693c7fa0d334 SHA-256: 7cd86e321631a97fe27510775fdcba83dec50ac3955bc2e40b190bde5be576da
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, including one pointing to a known malicious redirector at 'dafemum.ru'. Heuristics indicate it functions as a link farm, potentially for SEO abuse or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/123?utm_term=sql+format+timezone In PDF document text
    • https://noripuluse.weebly.com/uploads/1/3/5/9/135957130/kewefejibafixab-benikugatur-jutugijobu.pdfIn PDF document text
    • https://betoxugibujimiv.weebly.com/uploads/1/3/1/0/131071043/d0b4d.pdfIn PDF document text
    • https://mosuvixixe.weebly.com/uploads/1/3/0/9/130969854/nukor-jujiwemidone-maperetoriro.pdfIn PDF document text
    • https://jedavosezinuli.weebly.com/uploads/1/3/1/4/131438835/zafesisiraneje.pdfIn PDF document text
    • https://fobinoxibenor.weebly.com/uploads/1/3/1/4/131437242/daa1df5da28fba6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/37927769429.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/66658040612.pdfIn PDF document text
    • http://temomuduzuba.epizy.com/how_to_configure_zoom_for_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/which_fridge_brand_is_best_in_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/kuzefivinerawuwezu.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/80854534150.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/84005821664.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/19571930863.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/forensic_audit_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/63647823508.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/6835378432.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/para_que_es_cianuro_de_hidrgeno.pdfIn PDF document text
    • http://loxazugexola.epizy.com/brackets_software_for_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/dufokozigitejumi.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/love_breakup_sad_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/check_for_duplicates_in_excel_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/compare_entries_in_two_excel_spreadsheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/bkash_agent_apkpure.pdfIn PDF document text
    • http://sabolobu.epizy.com/la_esposa_que_ora_dia_27.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 5012 bytes
SHA-256: bd5de0c1937f805c7b7f87d521af018d5de6ed99d707e87b49d5e414e475c5b9
font_01_sfnt_off00010ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA6 11448 bytes
SHA-256: bf10d75bdb7ad549ccf409fd2ec8c984551922291942e15a9ad3f65f5ce26602

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