Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5c4d7097c2a895…

MALICIOUS

PDF

86.6 KB Created: 2021-03-23 05:17:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9b627c3c9f94c48addcf4dfc2349c646 SHA-1: ba8781ae143d6311fa9037636378909196927df9 SHA-256: 0f5c4d7097c2a89537512f0362317d63fa1ec23ede13dbda795bb62118e0ebba
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of numerous unknown reputation URLs supports the conclusion that these are intended for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://xajibur.ru/wix?keyword=i+don%2527t+want+a+girlfriend+yahoo+answers PDF link annotation
    • http://sodalabs.club/powerstation_psx3eu_batteryw0i7q.pdfIn PDF document text
    • http://digtalcaliper09.xyz/suxokifekojatotqu8v.pdfIn PDF document text
    • http://my-favshop.online/ralefemosogebemaxoju38b8o.pdfIn PDF document text
    • https://cdn.sqhk.co/gikiwifada/ihAhQha/lojufizekuje.pdfIn PDF document text
    • http://vezdesami.ru/bitsat_2018_papergw0sa.pdfIn PDF document text
    • http://gratoramm.website/dibekovarizopuniu2wuu.pdfIn PDF document text
    • http://topstop.site/vampire_the_masquerade_revised_edition3el9b.pdfIn PDF document text
    • https://cdn.sqhk.co/tevotapomow/hIihjhy/sniper_ghost_warrior_contracts_review_gamespot.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/giTiigh/fovedi.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/gigfmha/foritirenasorovoxemiwe.pdfIn PDF document text
    • https://cdn.sqhk.co/donewipimep/jihbhbM/53423814430.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/95059334391drwn5.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/hgeFid9/bollywood_best_ringtones_2018_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ledirevobep/gjpgdhg/rumble_on_the_river_2020_softball_tournament.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/Acpgihf/dufibu.pdfIn PDF document text
    • https://cdn.sqhk.co/dusivubeleza/yhaNEhi/amazon_seller_customer_service_phone.pdfIn PDF document text
    • http://instas.site/how_to_save_tableau_workbook_locallyorqdi.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/jc3wygg/zombie_infection_game_online.pdfIn PDF document text
    • http://damvglaz1.xyz/mary_j_blige_ziprn5dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_4eee965b0e7c4a79abcb4da637acc715.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_1776bd786b464ea795f673073e7c725f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/50060377446.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/jidusezavoku.pdfIn PDF document text
    • https://40c507a3-37b7-491f-afd3-f28ba3af1fb2.filesusr.com/ugd/7f5264_a89cbdbd92eb427f8aa6bfa6596755a1.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 5120 bytes
SHA-256: b251351103289907cd2e24a7a742f7c0d27afc90a2555c9b8bd927cdc5fe271d
font_02_sfnt_off000117c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C8 11196 bytes
SHA-256: 71038920442c04503ac248e19256e8bb7d5abbf340de1671a201ff247958c019
font_03_sfnt_off00013e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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