Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed624a99ff25db3…

MALICIOUS

PDF

82.2 KB Created: 2021-04-24 05:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1d679635cccce522aeb0b27b1bae7ab SHA-1: bf66c2184ec42f4f1313dad1c35dda011313e569 SHA-256: 8ed624a99ff25db36bc85c1ef18eb714fa2cc40fe36daf2ddf73e00f634da41d
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 pointing to file-hosting services, suggesting an SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://resalured.ru/strik?utm_term=how+to+clean+vicks+starry+night+humidifier+filter
    • https://cdn.sqhk.co/zifeduwa/jignYgi/space_armor_2_mod_apk_revdl.pdf
    • https://rovizefodizare.weebly.com/uploads/1/3/4/3/134309954/8182493.pdf
    • https://cdn.sqhk.co/wamiratena/jem4sgi/flight_simulator_2020_controls_list.pdf
    • http://alexandreablog.com/fexubevicwqcm.pdf
    • https://fitatopiwize.weebly.com/uploads/1/3/0/7/130739398/ledoj_sibogobofava_wifusuj_gatobidowe.pdf
    • https://cdn.sqhk.co/sopiloroda/hg0Jjef/73443811877.pdf
    • https://dufowazana.weebly.com/uploads/1/3/4/5/134529111/fumarasejo-pojuto.pdf
    • https://wanojotuza.weebly.com/uploads/1/3/5/3/135346096/lidafuwa.pdf
    • http://instasurprise.online/53291925005mtkx6.pdf
    • http://hristogrigorov.com/reading_plus_answers_level_j_marvel_man18tlb.pdf
    • https://cdn.sqhk.co/gulizate/tjahhNj/gaming_wallpapers_hd_i_4k_background.pdf
    • https://cdn.sqhk.co/vegedusovo/gSic3EZ/pixikafakupuzipelusukiseg.pdf
    • http://netlysy.online/fallout_4_map_size_vs_gta_5voj1q.pdf
    • http://stopro.store/599333320416sgwn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_d6a328e2a62c445faa29a2eae4ea09c8.pdf?index=true
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_8004379bfa2f4d3291f365b4b8ffc926.pdf?index=true
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_5a456cfce0ea49ecb0fd86f1705100e4.pdf?index=true
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_cc98a649d0134d45bb35ed127b13b81c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4292afc1-8254-462b-b7c0-31537834286f/is_gluten_free_food_good_for_type_2_diabetes.pdf
    • https://uploads.strikinglycdn.com/files/c5db747d-4d85-439a-8fc8-aa9768eefe7e/bebodamijevevufiji.pdf
    • https://uploads.strikinglycdn.com/files/ed633327-63d5-44b8-8a38-a0e9656af569/how_to_make_smoke_detector_stop_beeping_after_replacing_battery.pdf
    • https://97e6e6c8-040d-427c-ad66-6ef02350ae38.filesusr.com/ugd/9c523c_898f842a51ad4806ad6fa07ec9a319ac.pdf?index=true
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_5f2526ba07fd4531b38bb8fa919621ee.pdf?index=true
    • https://uploads.strikinglycdn.com/files/65b4e8a9-28d2-4160-8386-606551218171/46987491029.pdf
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_6b73844901874862ad6b28bc6cf04748.pdf?index=true
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_863b129e2d0e481fab07c6d02c3b4223.pdf?index=true
    • 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_off0000fbe9.bin
1fca0fb048548486edfe7f267fd604999fa4a4c0771ebf16b9874f4ad106f126		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 5716 bytes
font_01_sfnt_off00010f4d.bin
0358538319332122a83edd1a5928162a9f927ea3049b6e7968741c2afa365a39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4D 14232 bytes

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