Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcc4a29385c08d6…

MALICIOUS

PDF

81.8 KB Created: 2021-04-18 10:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ea37c41ab9c3802cf1c17ed3f812cb6e SHA-1: e8a25a1ce852fdfdfe3b246a90b859b665d3be86 SHA-256: 9bcc4a29385c08d6e4af88beed36b41e0f5db414b42a98582ee8e7f725f9cb56
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 0.9964

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://kuzutuzo.ru/strik?utm_term=song+of+ice+and+fire+characters+wiki PDF link annotation
    • http://fujigukatujewu.medianewsonline.com/2527699614.pdfIn PDF document text
    • https://cdn.sqhk.co/rovonoset/cA32hea/cat_jumping_on_kitchen_counter_with_foil.pdfIn PDF document text
    • http://merotudonor.mypressonline.com/47084098063.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/hjQRfig/cannot_repost_instagram_post_to_story.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/AwX5Chi/death_school_spells_and_levels.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/fvhibii/aliens_vs_pinball_offline.pdfIn PDF document text
    • http://xelamoxadavas.mywebcommunity.org/pelubajoverigagevepuwabo.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/how_to_renew_your_license_in_nc_online.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/83e78cf5-fd0b-4229-a08f-f395c4275b0a/m-audio_axiom_pro_61_driver_mac.pdfIn PDF document text
    • https://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_95d36d85ee884fbc94bb5bf5889ee81c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dfedaea-be51-479c-81a4-5620de8e6324/87970240546.pdfIn PDF document text
    • https://965bd944-310b-4209-a71a-d16e45aaced4.filesusr.com/ugd/5f02e6_2e82147f1b114dcc9148d7d7a4557238.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa7e364b-a620-4eb8-bac2-b288210ad6ce/reznor_waste_oil_furnace_parts.pdfIn PDF document text
    • https://80ce5912-1c67-4773-adf4-abf614566e91.filesusr.com/ugd/acb48a_113348622cd14cffa41fe325637e6f04.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccee0096-8e0d-4eea-b2d3-8ae531656b86/monepagonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201aa6ca-79f9-43f9-889d-c7c16e9b3dba/powersmart_db7651-24_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4bf0328-8c0f-4c88-bc29-e158f031c06a/use_geometry_not_riemann_sums_to_evaluate_the_following_definite_integral.pdfIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_da071ca5e13d42eba90eb83822f5108d.pdf?index=trueIn PDF document text
    • http://tuxefunuzire.atwebpages.com/dynamics_of_machinery_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/304ea98d-1441-4fff-88a6-4e35384808af/dolarimepivamarolewex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f7210b-ee72-4a1f-b942-557792d86376/adobe_premiere_pro_download_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3925d51f-d860-4ed3-978b-4d0481a07f27/sidivadezotogekoliw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c14f24b4-4152-47c0-abd0-86cb40bf5976/dsc_power_832_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f964f1a8-ca50-4d29-bba5-eeb2ff19b96f/wodibiwigozodinanajanozi.pdfIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_3ce2f9375f8b4c72a3a37e98d5ffd938.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c622ce4b-db7c-4f2e-8387-e8912f87881e/11490962602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/740b6577-2c88-44e4-9528-da3878960e73/samsung_galaxy_j2_prime_display_price_in_sri_lanka.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_off000100ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AD 5512 bytes
SHA-256: e944c543ace2a7445c2bbf8e346c4631634e4a381958c2b75896cf93a6614fcf
font_01_sfnt_off0001137b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 11204 bytes
SHA-256: 96f68d50912ecdaa128aa546c4f72c58af395ab5ffdc50ce7180672d694cf410