Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9900062ba301fa…

MALICIOUS

PDF

77.4 KB Created: 2021-03-21 21:15:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8d932577c6bdd4f6c274c4228f7f261d SHA-1: 966741e06bae408f5ea036eb9437bab89ec3e8c8 SHA-256: 1b9900062ba301faf3f539487860121307cab1e12bd2488c4793733f42d31ef2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://midufefew.ru/wix?keyword=1995+honda+civic+ex+manual+transmission PDF link annotation
    • https://cdn.sqhk.co/vatukaso/ohige7D/4250280921.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/Eiaa1Sp/37504547080.pdfIn PDF document text
    • http://interior.estate/crear_un_archivo_en_linux_desde_terminal4pwmk.pdfIn PDF document text
    • http://vevaroda.scienceontheweb.net/egyptian_cinderella_book.pdfIn PDF document text
    • http://nnorm-id.com/buzesotewokodojovulaxzlz5w.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/ibgehhP/necromancer_names_in_movies.pdfIn PDF document text
    • https://vatedubajepe.weebly.com/uploads/1/3/4/3/134371970/c09083.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/delhi_metro_card_recharge_offer_phonepegkajy.pdfIn PDF document text
    • https://gumarifubora.weebly.com/uploads/1/3/4/4/134465571/muxom.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/ap_human_geography_course_outline.pdfIn PDF document text
    • https://cdn.sqhk.co/tibatojo/ggghhTp/kexozorawibugesukug.pdfIn PDF document text
    • https://cdn.sqhk.co/vixokezafafu/vUicWB2/52825046887.pdfIn PDF document text
    • http://bexemusu.mypressonline.com/application_of_bureaucratic_theory_of_management.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/lunagi.pdfIn PDF document text
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/kadovep-fopulizuf-dubolu.pdfIn PDF document text
    • https://zejinimab.weebly.com/uploads/1/3/1/8/131856072/6223066.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_25c01ff27aae434f8b3567bb61c17812.pdf?index=trueIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_0214ae916f334fd9af5f2e17c658225a.pdf?index=trueIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_a7d3090cc50d44368f16b22648671d04.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_847c043dc8b0412a84bd7a5cf0719e00.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_765ff19fdef3485b82876ccf545c152c.pdf?index=trueIn PDF document text
    • http://satovimowenijor.myartsonline.com/55417522387.pdfIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_a203d5fe27d84e5b80ca2ac5ccc60c7d.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_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 5544 bytes
SHA-256: 00e98885a38cf1b705d4be4bf20c07e8bbeeb8c8980a7e181e14002e7b6ddbf9
font_01_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 10540 bytes
SHA-256: ab3d7eb9ea19da957d2dbd8e30920d047d7e62e6dd1d021699ec6da7e0d46c82