Malicious PDF — malware analysis report

Static analysis result for SHA-256 c320dc99ea3ef6fe…

MALICIOUS

PDF

73.9 KB Created: 2021-02-28 15:35:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b3f11ceccb79978b5bd60713e8197c45 SHA-1: 801186cd489e390b39e05eda7670c046173ea48f SHA-256: c320dc99ea3ef6fe90cf3135b8a297a1197b37c07b6de44e0e2edac50ca175c1
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure for downloading software. The presence of numerous links to disposable hosting and potentially malicious domains indicates an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/wix?keyword=fb+messenger+lite+apk+latest+version+free+download PDF link annotation
    • https://cdn.sqhk.co/sirepajaku/oShige1/xunirusabixepeto.pdfIn PDF document text
    • https://cdn.sqhk.co/mofinopedas/mQiahjT/kenny_chesney_greatest_hits_album.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375694/normal_5ff40c99a69bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448113/normal_6001373b8a489.pdfIn PDF document text
    • http://micrometer25bill.site/21544491879fite1.pdfIn PDF document text
    • http://mavpa.fun/what_is_the_best_quad_rail_for_ar_15cpnow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367278/normal_5fde9140014f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403276/normal_602ec457e82fa.pdfIn PDF document text
    • https://cdn.sqhk.co/difejekexe/5hqsjb7/ice_age_village_mod_apk_free_shopping.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/iihbWz4/one_stop_financial_services.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/mojenid/60743715045.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406473/normal_5ff87318347e6.pdfIn PDF document text
    • http://my-favshopc.online/actividades_para_aprender_a_leer_y_escribirhqmuj.pdfIn PDF document text
    • http://uablog.website/finding_high_probability_linesefxko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ritoma/executive_summary_template_business_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/16553919689.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_off0000e42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 5672 bytes
SHA-256: b2e7f2106306bab08414b14510d122e046badd39299d269a64ddd89cce261d7a
font_01_sfnt_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 10148 bytes
SHA-256: 47cc8ccaecf909b9069f81d1e9d7a137162392f30243afa86ae2ab64ed0126f3

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