Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d97d7d8159a459…

MALICIOUS

PDF

75.5 KB Created: 2021-03-11 03:55:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 903e870e9801d742b510cff8db2f8eef SHA-1: 764a7702bad40381f53f5dbf17265b40e473a45d SHA-256: d4d97d7d8159a459103575e5ca1f551d011221095d67a3b5333bdde4e8a52605
226 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document may be intended to trick users into believing they need a password for an archive, a common method to bypass gateway scanning. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dugedepap.ru/award?keyword=10th+class+maths+notes+pdf+chapter+7 PDF link annotation
    • http://fitokapss.xyz/auto_formation_windev8jo1w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402252/normal_6029e49b14f41.pdfIn PDF document text
    • http://discount50.pro/ejercicios_pronombres_personales_tnv78fq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_600afccda16d0.pdfIn PDF document text
    • http://wellwork.site/pollo_loco_double_chicken_tostada_salad_calorieslktty.pdfIn PDF document text
    • http://artistichomesolutions.com/ff14_class_guide_20190n8ql.pdfIn PDF document text
    • http://insurancesouk.com/how_to_use_electric_lock_pick_gun1v3r6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474206/normal_6030801e17d7a.pdfIn PDF document text
    • http://ideal-it.fun/ribatikunetefavedoroniguv6zm2.pdfIn PDF document text
    • http://energytik.net/dhet_bursary_application_forms_201919sil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_ca6ccfb7841443bfa782802a4897b4ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c094c8b0-42c3-43af-8972-51a5ab1aa63c/derechos_humanos_en_mxico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d72c506-91c5-4e99-b751-28381d2562f7/lewavozib.pdfIn PDF document text
    • https://fa0867c9-8cf0-46f9-bfae-aad8e49c21f3.filesusr.com/ugd/cdba2c_7c112832ec4b46cfa0d2280a56e091ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36aa2e59-ae35-4490-a840-8748d0fd0eb9/5939286707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80facaaf-0e83-44d3-a0de-22808dd28dd0/96_jeep_cherokee_fuel_gauge_problems.pdfIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_7ac4886056f6484bbc3fd30ba7f519e4.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_3ad9272acf2d49e19ccf94a41351a1d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaec1ffe-aebd-4fd1-ac2a-fb62b7d0c4a9/which_weight_loss_app_is_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79fe914e-bbd6-479a-910b-904ce698dc49/14362772972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/481278ea-9a4e-4ee6-80c1-c72885f9d22e/ubee_dvw3201b_wifi_password.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_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 5576 bytes
SHA-256: 9b5da2d2409d5a349a05a481431a6633fb80e2663a0c8f5aec98e3dede874e18
font_01_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 10760 bytes
SHA-256: 8551019f6a21be281521ed9eaf983bc8ca985f4b6d8402510c216f99d234b378