Malicious PDF — malware analysis report

Static analysis result for SHA-256 1632dd71557ac778…

MALICIOUS

PDF

75.8 KB Created: 2021-05-05 14:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f4f78a7a8f853fec2d33ad29296bf348 SHA-1: fadb26b5ef1235fd503a0a102e4b8773e55eed89 SHA-256: 1632dd71557ac77815b44bb43ca0ca7dc948560d15b7ad1f3dd0da1e12a1e27a
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is designed as a link farm on disposable hosting, further supporting the malicious intent.

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
  • 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://pelibifir.ru/strik?utm_term=what+does+cash+allowance+mean+when+buying+a+car PDF link annotation
    • http://center-san.ru/3293425758m8sh0.pdfIn PDF document text
    • http://italywow.info/best_way_to_cook_king_boleteuldwu.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/if5W3ij/86827338376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416490/normal_6019aafaa8296.pdfIn PDF document text
    • http://cafechorsu.ru/hp_officejet_4500_driver_windows_7kzkjc.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/celi_3_esame.pdfIn PDF document text
    • http://fitness1.space/vaibhava_lakshmi_pooja_book_in_telugugiklu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369165/normal_5fcf676c1adfb.pdfIn PDF document text
    • https://cdn.sqhk.co/gosuzufus/c5wVigg/soluneviwutujewa.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/19485806066.pdfIn PDF document text
    • http://bupro.asia/how_to_reset_a_kenmore_microwave_ovenzocc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466411/normal_605f9d3950372.pdfIn PDF document text
    • http://nazhivy.net/cascando_beckett7bipw.pdfIn PDF document text
    • http://doctora.club/jubilant_foodworks_annual_report_2018w1bjh.pdfIn PDF document text
    • http://circulyarkadigital.xyz/porter_cable_fn250b_piston_stop_replacement5jqka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvodix.myartsonline.com/dowuderewedatexifururalop.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/ibm_data_science_certificate_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/delonghi_pinguino_pac_we128eco_silent_review.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/waxerefibovokoziterukan.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/does_corn_have_a_lot_of_calories.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_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 5700 bytes
SHA-256: fddfd2a563b3c5449ac80be447d18f4edb45d65b0c563156be8eaeafdc5cb43c
font_01_sfnt_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 10356 bytes
SHA-256: 290ed0f84a7cdd22129031afbb4340391771c6733d5d8c01acc9c91ac731172c

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