Malicious PDF — malware analysis report

Static analysis result for SHA-256 344f1a42911da169…

MALICIOUS

PDF

86.0 KB Created: 2021-01-27 16:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0b2ff858b82a08d77ea30e6a8ab8a1d6 SHA-1: 1fdca371b2cc7a710d6798db934c5b1532528f3b SHA-256: 344f1a42911da169d0ab311bbb16b479ac54a37967f77f10dc03e1dfdc131b93
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or distribution network. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://seumenha.ru/123?utm_term=radioactive+decay+worksheet+2+answer+key PDF link annotation
    • https://kabenodetaxixum.weebly.com/uploads/1/3/4/7/134754863/mijizatagaz_zenixape.pdfIn PDF document text
    • https://nirereki.weebly.com/uploads/1/3/1/4/131483126/4014588.pdfIn PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/zejugewetorix.pdfIn PDF document text
    • http://kigowamukidiba.iblogger.org/beats_x_review_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_5fc7a83ee3695.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420911/normal_5fc9cbd199000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_5fd6657fc2f15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470209/normal_5fe4104e6a23e.pdfIn PDF document text
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/9248632.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369522/normal_5ffcfe248ba5c.pdfIn PDF document text
    • http://varuzajuv.22web.org/information_system_audit_report_sample.pdfIn PDF document text
    • http://menedowu.iblogger.org/master_franchise_agreement.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mubemutolewe/46227589661.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/forms_the_umbilical_cord_blood_vessels.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/fusebogexaximelodipa.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/android_one_wallpaper_change.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/itni_bechaini_leke_whatsapp_status.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/69286267850.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/momifimulifejowegedabemo.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/last_of_the_summer_wine_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/guide_du_routard_myanmar-_birmanie.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/empirical_labs_el8x_distressor_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/pakuxiviwe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 5240 bytes
SHA-256: a3ef93a995790b6887dff3c2d8cd90ac589550d0e1e34af5f834cc2323f97143
font_01_sfnt_off000116cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CF 10964 bytes
SHA-256: c412eaac9f3c8e8efb7aed24c07207d79f3c583d537a9446f6a4b9fd0cc50bca
font_02_sfnt_off00013c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C24 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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