Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea20234ae1674c6…

MALICIOUS

PDF

77.2 KB Created: 2021-03-26 13:26:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 740c1f3feaaecc77dc96df052103af81 SHA-1: a81db6bd83ba75b84ba184d7fc18b71d5b6060fa SHA-256: 4ea20234ae1674c694131840360205f514147638bec162db6f03d5f5b50c9a00
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. Although no scripts were explicitly extracted, the PDF structure and extensive URL usage are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/123?utm_term=board+meeting+minutes+with+action+items+template PDF link annotation
    • https://guxedujigizos.weebly.com/uploads/1/3/4/7/134735137/8257061.pdfIn PDF document text
    • http://ritukokodew.22web.org/soundlogic_xt_ottoman_speaker_charger.pdfIn PDF document text
    • https://cdn.sqhk.co/melalisopapu/OPigdqz/world_challenge_sports_car_racing_championship_series.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/heBgit9/vevoxajaragodunow.pdfIn PDF document text
    • http://dunotap.iblogger.org/824334423.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/hierUgh/41957857827.pdfIn PDF document text
    • https://fobafomenizu.weebly.com/uploads/1/3/4/7/134753661/32b8784646f5c10.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/jjAliek/dvd_rw_burner_software_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fufigavaki/ijidheY/nuzanomokekuwilaba.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/hiio8O4/bemufaxaki.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/gL1V7F3/30363282959.pdfIn PDF document text
    • https://burekanokem.weebly.com/uploads/1/3/1/0/131069897/4ce473b12e3bc.pdfIn PDF document text
    • https://gagegopered.weebly.com/uploads/1/3/4/8/134880179/7342405.pdfIn PDF document text
    • https://cdn.sqhk.co/razuwilok/Rigjigi/monthly_expenses_spreadsheet_template_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/517T0id/origami_kusudama_flower_instructions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_95f295719bf04363862f6a71fcc8ebb0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/silejezufewaju.pdfIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_d406428eebf2420da331d5fb5ef56686.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_453ee648ba4b4433a289d4de916cb62b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajezife/draeger_breathing_apparatus_manual.pdfIn PDF document text
    • http://mexorilurolepap.rf.gd/financial_accounting_tally.pdfIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_234b848709194591b9bc3a2ee0ee5b98.pdf?index=trueIn PDF document text
    • http://zixaxonenugoko.epizy.com/noida_metro_admit_card_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 5628 bytes
SHA-256: 7870164080a934460f4ec7ba47c889ff63b3cfa7ba33a35f85c2eeed5f054587
font_01_sfnt_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 1804 bytes
SHA-256: d9c0a6c11b05c4a851b04fea94498496aa899470d307513bb991c37a842bde18
font_02_sfnt_off00010247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10247 10696 bytes
SHA-256: 34ff1299ae3a0fc516fe75458caf8ad629be0d384199fb2a83d5dcaa4e1476a6