Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff431e2e52306a1…

MALICIOUS

PDF

77.4 KB Created: 2021-04-02 09:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 14ce60ad5fca8f6be5f50a72f4008aeb SHA-1: 01d87e4a48635c64afa1bb91dfa3f51a64c1135d SHA-256: eff431e2e52306a11611dbb8aab9bd06d47b60a76d35e733368a0f798e244789
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical PDF link farm detection and a ClamAV signature for a phishing trojan. The document contains a large number of external links, many pointing to PDFs hosted on cloud storage services, suggesting a link farm or SEO manipulation tactic. While no scripts were extracted, the sheer volume of external links and the critical heuristic firings indicate a high likelihood of malicious intent, possibly to distribute further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://lafazomutege.weebly.com/uploads/1/3/0/7/130740298/repawuluzeriliz_wosefawe_vejabasizojabew_mepeludode.pdf In PDF document text
    • https://ninalekenapuboz.weebly.com/uploads/1/3/4/0/134017067/37586.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/80af7fcd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/razvivatel/yapz/~3/gOBB6uaVNRA/square?utm_term=en+1092-2+pn10+flange+dimensions+pdfPDF link annotation
    • https://s3.amazonaws.com/kiguteperilodu/sample_closing_costs_sheet.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_40a93383a17f4a44a7a4334d62956a25.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefabe/nervous_system_disorders_worksheet.pdfIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_91ed315a9d464259b6ec09c0dfa06ff5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/zexoboridamakim.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/89897236538.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/hp_laserjet_m1217nfw_mfp_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/birogel.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/gipikazipivelisofakaze.pdfIn PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_bc1723d523d340e084c164e27631a7cb.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_f49344d4170c4297925e8e27d461d221.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kevava/best_air_purifier_for_allergies_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/25760773276.pdfIn PDF document text
    • http://kepijemimubu.rf.gd/international_financial_management_jeff_madura_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/mama_bear_legal_forms_promo_code.pdfIn PDF document text
    • http://logabijizuz.epizy.com/lurativijudowupojupurud.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/kannada_movies_new_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/jupibuxitivomazak.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_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 5736 bytes
SHA-256: d9780738583d4df896a0028dfee166d5838e6af8fbf8575229c3e46068e8acf9
font_01_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 10856 bytes
SHA-256: 1999d45451bbdad044d0887ad3da2c7c0878eb94e6cb7a5acbe2d0ba7cc20278

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