Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f917778c2553e57…

MALICIOUS

PDF

80.9 KB Created: 2021-06-06 06:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9442b1a255da12d7ce5a3ff6d3bb44d3 SHA-1: c6d0e38aa4c8e218ff0ae1ace7f5d7e59d5a8d27 SHA-256: 9f917778c2553e57596a19cf702868e2facd1aa6498f78cbe23a04abaddef0a1
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 0.9997

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
  • 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://nipisod.ru/123?utm_term=cdc+vaccine+information+sheet+hep+a PDF link annotation
    • https://dewosuto.weebly.com/uploads/1/3/1/4/131453399/82ed3e5eac1.pdfIn PDF document text
    • https://vexikolilugurud.weebly.com/uploads/1/3/1/3/131379290/lomulomomomako_daxuda_wizezepuvinutel.pdfIn PDF document text
    • https://kabatinamipe.weebly.com/uploads/1/3/4/6/134636342/ramabupuguluji-jonogiwor-wejenowese.pdfIn PDF document text
    • https://mutimerujufidi.weebly.com/uploads/1/3/4/5/134526942/viwama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_6065f2a13bce7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383798/normal_6059c40a03e35.pdfIn PDF document text
    • https://naxuvate.weebly.com/uploads/1/3/5/9/135960989/eda5f399cc8.pdfIn PDF document text
    • https://sexozorojupur.weebly.com/uploads/1/3/4/3/134390270/lomugifokakobum.pdfIn PDF document text
    • https://rijokurep.weebly.com/uploads/1/3/4/3/134377239/zuxakosavag.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/gewuku_zuvojejemufuf_nipoweferotafo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445864/normal_5fffb84d9c3bd.pdfIn PDF document text
    • https://kenigoxiwe.weebly.com/uploads/1/3/0/9/130970014/riloka_rejifigano_vojuwojaremarus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144426876/prestone_driveway_heat_msds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa143e6-985a-4ea1-b41e-5d4ed15fc119/irregular_verbs_in_french.pdfIn PDF document text
    • http://zexowisam.pbworks.com/f/what_foods_are_low_in_fat_and_cholesterol.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/w/file/fetch/144651669/german_genitive_adjective_endings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4aa0513-c7ab-4ded-8380-eec878f5ebbc/vasafuderem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6af5cc2-7687-4c4f-ae25-7005d6b33e81/86615636341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfc87291-5806-4659-8e44-8ccd8dff95c1/a_raisin_in_the_sun_webquest_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41b4eab3-496c-416b-b53c-fb4dce69e2c2/kijudoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60536eb4-87a1-4816-8bea-b14b1a2a857d/nugidene.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_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 5328 bytes
SHA-256: 559d3706f3919c61ec8955efe5fd816919ab67f7eac1c12873ca048b8eeda3b9
font_01_sfnt_off0001134b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134B 10236 bytes
SHA-256: 333c6cb7ec3b17bec4ce2cad106147419925bbbcccebcc0ef5ec94ef95298491