Malicious PDF — malware analysis report

Static analysis result for SHA-256 90657eaf05aedca8…

MALICIOUS

PDF

81.1 KB Created: 2021-03-29 01:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4086b040dab92abb95de7279189a767d SHA-1: cd6bcae814054389f1bf6bb7cc179c0f1cd1354a SHA-256: 90657eaf05aedca89fc3c5e7950ad29e3d0c869bb22533201c89d0ca4772191d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many pointing to disposable hosting, and at least one known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the primary attack vector appears to be the redirection to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=taquineries+entre+amis+pdf+ekladata In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419002/normal_604ba5c46f6d3.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/norelco_aquatec_changing_blades.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_601ffd84090c0.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/nujorediju.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/kung_fu_panda_fighting_games_free_download.pdfIn PDF document text
    • http://nugowimabu.mywebcommunity.org/ankle_brachial_index.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/2a965f5c-abcb-466b-a29c-79140f35dfa1/fluke_dtx_1800_price_in_uae.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4109eb8c-4b25-4907-a8c4-bac097ee623c/xonikupovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01566fcf-7f8d-4c1d-b1a0-f90862529499/14450716347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20bd6c8-61d4-4fbc-a43b-6f0e1ddd0fc2/pronoms_relatifs_exercices.pdfIn PDF document text
    • http://wumugajus.onlinewebshop.net/casio_pro_trek_prg-270d-7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7968a205-fa22-4826-88fc-ea0c6db37d64/81723159625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d26cc1-e4ec-4c88-99cd-88556bc86860/how_much_do_foster_parents_get_paid_in_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0399eac-31d0-484d-ab69-705efe2ac085/gofukuxuzilonisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ba0852-8c62-470c-a998-df41a6d9b1fa/the_medieval_period_of_indian_history_ranges_from.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_707c06514c6a45e78a37ba731cb40938.pdf?index=trueIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_8bdf957b697b423cbc46a51b33114519.pdf?index=trueIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_1c597d6e50914b238b7d0f35149f9267.pdf?index=trueIn PDF document text
    • http://davofunup.onlinewebshop.net/ipibl-lb_bios_flash.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f16e96-941d-4534-9199-9e375becddef/emp_jammer_schematic_slot_machine.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
    • 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_off0000e002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 5328 bytes
SHA-256: ccde17e97382c95e90f9620aa3197a105956d69107780db0d923385c6d5dedea
font_01_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 16464 bytes
SHA-256: efa09fe35758c8bab1e8a3c239bb28b8783e2ee772017931c1c225faa0823f8b
font_02_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 14496 bytes
SHA-256: 645bfbd41b285e1628e2245e1f782c86e75d700f4125a9afd0d818bbe19579a1