Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4d841545884fc4…

MALICIOUS

PDF

114.6 KB Created: 2021-04-05 21:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d28d602ac7f7c10d499e3c3288b84e09 SHA-1: ed0f13933286c77468cb4ea467404b0cb9adfa84 SHA-256: ab4d841545884fc4256c058fbfc616aec32c120e1c036b08a69099006f8b13c0
166 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses a password-protected-archive lure. 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 0.9997

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
  • 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://vilenefex.ru/award?keyword=clinical+examination+essentials+4th+edition+pdf PDF link annotation
    • http://nizavevorupuj.mywebcommunity.org/secret_of_the_ages_robert_collier.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/puboxegumedori2r7yb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_60521c4607e2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418777/normal_5ffd24463a9f8.pdfIn PDF document text
    • http://fogejebimo.scienceontheweb.net/nudozimakamotuwidade.pdfIn PDF document text
    • http://milesnires.xyz/what_color_light_reflects_bugs4elzu.pdfIn PDF document text
    • http://lightstart.xyz/treasures_spelling_practice_book_grade_4_answer_keybvwtg.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/definition_of_bullying.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/ce40c603-ae14-468e-a959-5e2c86d3b14d/absolute_surrender_post_falls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eafe8b1-2bd5-41c5-b429-3aeb1ae7de57/50329374780.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/turoth_slayer_guide_osrs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20429528-fc13-45a5-97ea-34074f99eaba/82840796355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c1df489-2798-4fc8-817b-a532d1e4825e/56224871852.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/grade_7_math_textbook_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/natis.pdfIn PDF document text
    • http://pulitisagot.atwebpages.com/lozuka.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/mr_heater_big_maxx_50000_btu_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fcfbb34-dc09-4fb3-8ce4-9d8c755c673f/robidaj.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_off000180df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180DF 5360 bytes
SHA-256: e49ca7c29f857a601917e4536f6fd18c3b73e32eefd7275e77d0e1acfc6286f0
font_01_sfnt_off00019303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19303 12232 bytes
SHA-256: d9a52a6b66d44e3b6856821741a3d6a12c8683a9920a397d7e0d8f1fe54061b0

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