Malicious PDF — malware analysis report

Static analysis result for SHA-256 13044e3325f74ea8…

MALICIOUS

PDF

75.1 KB Created: 2021-03-14 05:45:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: dbebdfdb86364a58687054b3152653fd SHA-1: d6c39fb7c5ad4f1945399b25306790c7ada86b30 SHA-256: 13044e3325f74ea88471aad4b75324e2f20af8ab5fd64e8e7d8baad858ae563e
166 Risk Score

Malware Insights

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

The PDF contains multiple suspicious links, with one specifically noted as an 'invisible link to suspicious domain' likely intended to trick the user into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://druttle.ru/wix?keyword=word+start+with+letter+h PDF link annotation
    • http://businesshelpservice.com/caa_bill_in_hindi_download_2019k2hlg.pdfIn PDF document text
    • http://buyfastedcircle.xyz/dikawaribiwogab0il.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421778/normal_5fdf8fd58b552.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496391/normal_5fdff73596c6a.pdfIn PDF document text
    • http://copyrightviolationcenters.com/word_search_app_for_android_free_downloadl8k79.pdfIn PDF document text
    • http://loginwithfb.site/parifofomujudepq7y6t.pdfIn PDF document text
    • http://aduo5.online/lupibetexwya.pdfIn PDF document text
    • http://tokio-2020.fun/suzuki_250_atv_carb_adjustmentetylg.pdfIn PDF document text
    • http://instofficial.online/niferagitepakavxo0v.pdfIn PDF document text
    • http://monongzhlh.space/how_much_does_a_financial_accountant_earn_uk6q4iv.pdfIn PDF document text
    • http://topsale.pro/rental_property_income_and_expense_spreadsheet_freeew950.pdfIn PDF document text
    • http://ludshop.xyz/problemas_y_retos_de_la_educacion_basica_en_mexicogvmsp.pdfIn PDF document text
    • http://raifaisentgo.online/nets_ewallet_software_downloada88ai.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/sigobija/employment_tax_return_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/pupokijanujanube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f174325e-7f6c-4cfb-95a5-db44b2a9f852/where_can_i_swap_my_sodastream_gas_bottle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0402d433-7663-44d2-a860-12dab08861bc/57395785114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9182ae85-0cfb-4548-9c06-96bb57518221/resistance_loop_band_workout_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/051ff6f4-7cc4-4142-90cf-669d4ac00e9d/what_do_different_color_beads_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ec7213-8280-4d8a-b99a-1a7075e14cbd/xopuwewakozorejizo.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_off0000e907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 5016 bytes
SHA-256: 2a738cf5f54c2eb014fafd6a43b7688709b6a64462c6fb94c5487fe1156f510d
font_01_sfnt_off0000fa28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 10928 bytes
SHA-256: 2d4342f9fe266d47b6cd735344004ab90accf1ec5d8395dd45375bd0883fb944