Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f5a9d31e8639c8…

MALICIOUS

PDF

87.9 KB Created: 2021-03-09 21:18:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 13575e80f45a82d12deddab3f31e314c SHA-1: b009df086517cccc78e6024eea1c3d0c22379c62 SHA-256: d4f5a9d31e8639c8eadc802691eae45d990ea927671914f9a2d2011cc5871017
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/award?keyword=bodyweightfitness+recommended+routine+pdf PDF link annotation
    • https://cdn.sqhk.co/lamidipeke/jcL2gdy/final_fantasy_viii_remastered_achievement_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459654/normal_5fde7f5fcf969.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/ggiiiiv/nugajilujomanerixefulono.pdfIn PDF document text
    • http://fibisazorowax.mypressonline.com/alcatel_one_touch_pop_star_5070d_firmware.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/2ibUHij/nitro_rc_truck_racing_videos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413702/normal_6024a3bd07aeb.pdfIn PDF document text
    • http://cashfree.store/943827769247qpth.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/all_tags_and_attributes_of_html.pdfIn PDF document text
    • http://efarbok.xyz/cestui_que_trust6u84c.pdfIn PDF document text
    • http://koprovk.xyz/vitamix_a3500_sale_ukiqjc1.pdfIn PDF document text
    • https://cdn.sqhk.co/xobanozizesa/HjaLuwP/zadikugokuravabulezizigub.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/9gegchh/41116604294.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484609/normal_5ff607c0c974e.pdfIn PDF document text
    • http://7gusevshop.website/exercice_difficile_barycentrev7jfx.pdfIn PDF document text
    • http://reduslimitaly-official.website/8093481413npr4r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416513/normal_6031ff5b6554a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/538c3910-b2ba-40c5-b07b-6bb8742f089d/vapukukujifuwirelizog.pdfIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_0eb7cf6fbded40b38c7e7aa2a22ada46.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_8d571ded40734398b3037f673ecb4c41.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be20a36b-4d02-4210-918b-7d4f6f1b39ea/how_does_apneic_oxygenation_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7827692-3838-42fa-b25f-05797c506189/blueant_s4_hands_free_car_bluetooth_speakerphone.pdfIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_47d7cdd02454425eb5f66bd7a765080c.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 5568 bytes
SHA-256: 4aaa5af9f6c3461ef25635fd210d48460f0be652a520e760c4753c15b44865fd
font_01_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 10848 bytes
SHA-256: 2d9e49b34261dc271560b32bfe2c7cc0e291f804ff5ac94a755006b1a5dc19b6
font_02_sfnt_off00013d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D59 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb