Malicious PDF — malware analysis report

Static analysis result for SHA-256 400525c56a6bc357…

MALICIOUS

PDF

81.0 KB Created: 2021-03-28 11:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fdc3d9406a001345b3683aac93c039a4 SHA-1: 7ae9405f828082a5ad7a314b5fe9f7b00e3b642f SHA-256: 400525c56a6bc3571fcaa9a90405af40a7b4626d145b29b34358424320f2cde7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains embedded URLs and heuristics indicate it is a lure for credential phishing, specifically targeting MFA or one-time codes. The document body, though partially garbled, contains text related to stock market crashes, suggesting a pretext for the phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://bologen.ru/strik?utm_term=is+the+stock+market+going+to+crash+in+2021 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383470/normal_5fcd50f249d9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374715/normal_603e376d0f4ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_603855f0e2d9a.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/16533301788.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375356/normal_5fc68760a346f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481062/normal_601dddb33563b.pdfIn PDF document text
    • http://dipugipedanam.sportsontheweb.net/keurig_k400_2.0_brewing_system.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380088/normal_5ff1d186df0e8.pdfIn PDF document text
    • http://sidufapas.mywebcommunity.org/python_3_language_reference_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382639/normal_6058b31b9008d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461484/normal_5fc5c9ab02146.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_53a6ea22e5bf4527bd15e0a82eb704d8.pdf?index=trueIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_fd4f22660a1841ac888b69caf7bf1829.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_302c7b799d6f4416a5b84412a3096dbf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebisop/77697752935.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/xitoxadiliwofupiwili.pdfIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_786db83f6f5248b9b5e02ec9dec29bf0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/software_installation_user_guide_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df28c409-325b-44f2-846f-dfe2852fd259/93223491424.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/19672046079.pdfIn PDF document text
    • http://nupuzawov.onlinewebshop.net/ccna_course_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44f3d145-8f5a-48eb-a704-934e9b100267/how_to_adjust_wahl_detailer_clipper_blades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/548230d3-f6fb-415b-af46-9a598da88169/xigukawesaxogavarexupuj.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/bollywood_movies_full_hd_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c18ee29-0758-4019-8508-da3529ac1ff6/practical_english_usage_swan_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91dbedfb-0e1b-42a2-834b-a4a6c6f98b9f/26639692777.pdfIn PDF document text
    • https://d7504aae-3d37-493f-8789-a5629a6fcc30.filesusr.com/ugd/7ca9f5_0076d491839d4858878365746a1a6c72.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 5508 bytes
SHA-256: 7fdc908b5594edc1ba7209fed8ff5feba83da769635ef9a7f98857a348eba09a
font_01_sfnt_off00010cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF2 11628 bytes
SHA-256: 40e05e165dec4df40dab4293d226f5a7907bf5afa240ae30652939187d0c2768

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