Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cf231dd512a430…

MALICIOUS

PDF

77.7 KB Created: 2021-03-25 17:19:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b39e4fbb4cd2c4cfd838e471ed452a4 SHA-1: 27a0174c987b1bfa2d371647b3b8b6ce3d4e98db SHA-256: d2cf231dd512a430977e0ed39bb91566eaaca9a9e2fdf6a1d90f8716a5be3986
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/strik?utm_term=how+to+grow+cherry+tomatoes+in+florida
    • http://yachtcharter.group/islamic_names_meaning_in_urdu_list_girly1znd.pdf
    • https://cdn.sqhk.co/rinilafexowi/T4n3fhd/tiktok_video_downloader_no_watermark_app.pdf
    • https://cdn.sqhk.co/zovitamojim/fghEieu/take_off_flight_simulator_unlimited_money_pc.pdf
    • https://cdn.sqhk.co/sekigozujeme/2RXhigg/50721596224.pdf
    • http://getdouche.xyz/12190137895nwodf.pdf
    • https://cdn.sqhk.co/xezafube/dgiiYyT/pasarolin.pdf
    • https://cdn.sqhk.co/vunalogivefu/ifAifwY/keto_chicken_goat_cheese_spinach.pdf
    • http://pipvip.ru/solucionario_quimica_organica_wade_7ma_edicion_volumen_1droqx.pdf
    • https://cdn.sqhk.co/guwuweri/Wihgju4/loft_store_near_me_now.pdf
    • http://natur-bio.space/broken_angel_status_songj9fxy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jalasilunaz/5397021454.pdf
    • https://s3.amazonaws.com/woberiz/86458014462.pdf
    • https://uploads.strikinglycdn.com/files/735afe9a-fd21-417f-a3b2-6155a6cb5413/introducing_philosophy_solomon_11th_edition_free.pdf
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_b85ec99d8ab5463290e5163007855373.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b9dc0f80-2dc3-4608-b77d-25ac6b993a67/bidipapasisojojotovaj.pdf
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_8e27cf23e7254d19bd60a01308a51b02.pdf?index=true
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_c3532689491d46b7a2b8fb30b3f6b4b9.pdf?index=true
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_45a238e3b44e48178090f1cdbbefa070.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d14e1bd5-73e7-49f3-b66f-aa218e8837dc/4th_grade_reading_worksheets_free.pdf
    • https://uploads.strikinglycdn.com/files/4cdfc5bd-5051-4b50-bf9d-0fe0f699ae96/what_is_the_difference_between_primary_and_secondary_drinking_water_standards.pdf
    • https://s3.amazonaws.com/zijivevip/64811119265.pdf
    • https://uploads.strikinglycdn.com/files/e618da56-6493-4eb5-926f-3d62bd08642b/woboliwaxufu.pdf
    • https://s3.amazonaws.com/zerepuzuze/barimafejasubezuvi.pdf
    • https://s3.amazonaws.com/tarizirefevifab/78331405205.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f017.bin
711559dc72d2849537f3cc298a513f62e42769aea781b01bfc13c0715c05cfbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 5592 bytes
font_01_sfnt_off0001030c.bin
5eb27aff0e13e0eefbce3a21999d951aabbf153c42484d62714e7c457ce3bb71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1030C 10732 bytes

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