Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6e78b1e389fa44…

MALICIOUS

PDF

99.5 KB Created: 2021-02-16 20:13:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f4f429cbf50fcf8df72e078ea273613b SHA-1: 5c1ca056a08c3bd6948334052dfeb8980508c5b8 SHA-256: eb6e78b1e389fa44c0499bc66f78af9e45cae45d65a1aedb8f75e358be08ba48
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with heuristics indicating it's a malicious redirector and part of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO spam. No scripts were extracted, but the presence of malicious links points to an attempt to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/123?utm_term=belkin+n600+db+wireless In PDF document text
    • http://sosed.market/lomipid7q4d.pdfIn PDF document text
    • http://lojasamericanasbr.com/68404284757g5khg.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/c872df4d8.pdfIn PDF document text
    • https://fefajuvojamunuj.weebly.com/uploads/1/3/4/7/134750085/1082b.pdfIn PDF document text
    • http://lnstagram-office.com/la_batalla_en_el_desiertop2lxs.pdfIn PDF document text
    • http://logoped-samara.ru/87144799255lliob.pdfIn PDF document text
    • https://vupolape.weebly.com/uploads/1/3/4/7/134749420/nofumamadazijiluv.pdfIn PDF document text
    • http://opssmall.space/historia_tematica_de_los_derechos_humanosi783n.pdfIn PDF document text
    • http://dutov.org/sheet_street_sherpa_blanketsqiphp.pdfIn PDF document text
    • http://summer-italy.fun/nazeminanunukatikatay2m.pdfIn PDF document text
    • http://barberking.best/2982186347mmecy.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/xukanomarexumu/free_tetris_game_for_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/chale_aana_song_music_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/wild_buffalo_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/wepiwemum.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/21784656757.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/extracurricular_activities_harold_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/integrated_chinese_level_3_workbook_answers.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_off000147e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E5 5248 bytes
SHA-256: 19f0f24cfa0945c60e397d2913481bb713c073a44f48696fa53fca1fa961ad69
font_01_sfnt_off000159e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E3 11640 bytes
SHA-256: 2c6a4b3459d542690677c3a216772dddc6906915571a6f4c0547ee86556bce5b

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