Malicious PDF — malware analysis report

Static analysis result for SHA-256 be479a27739082d2…

MALICIOUS

PDF

110.2 KB Created: 2021-03-17 05:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2ae00970bfde8397609fcb88d5cf1ec0 SHA-1: d457f7a56c72ac8df7649656fc033ca0251ecced SHA-256: be479a27739082d28db75accbfbb9350df705b64ec9ff757b99a7a6cb0e7ce1c
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://baarspo.ru/award?keyword=list+of+beverage+companies+in+uganda+pdf PDF link annotation
    • https://lulotabo.weebly.com/uploads/1/3/4/7/134745182/3599346.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388181/normal_6002d1362400b.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/the_gym_teacher_from_the_black_lagoon_reading_level.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/topical_bible_study_lessons.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_5fd3ab6d58ff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482027/normal_60254f1a98aed.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/47933437318.pdfIn PDF document text
    • https://ralutadepijug.weebly.com/uploads/1/3/5/3/135305627/xukudip-mukigilalon.pdfIn PDF document text
    • https://bejulukif.weebly.com/uploads/1/3/4/7/134746679/xazedalojeme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423148/normal_5fd2d193a2ff5.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/childhoods_end_1996_full_movie_download.pdfIn PDF document text
    • http://kivafijap.mywebcommunity.org/soluciones_isotonicas_hipotonicas_e_hipertonicas.pdfIn PDF document text
    • https://bunepefetupudir.weebly.com/uploads/1/3/2/7/132741430/8396730.pdfIn PDF document text
    • http://lazotub.mywebcommunity.org/1277334620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448731/normal_5fd379ad4a052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_6023b9b92dac2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416139/normal_6031eb630a730.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369936/normal_5fe35ed8297d1.pdfIn PDF document text
    • https://kumaradogutaf.weebly.com/uploads/1/3/0/7/130775833/2494244.pdfIn PDF document text
    • http://godotobekof.scienceontheweb.net/jowatabozotedexiropapab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xowobovu.myartsonline.com/21697990839.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F39 5584 bytes
SHA-256: 1556f006874f70e58f3fcec92db320b5a422b38cfba23a83c69c7150dcad0175
font_01_sfnt_off0001722c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1722C 10456 bytes
SHA-256: a98c0f530a4e8fda489c270ad232cf9c69c82d01a3a5afea64375b94835596b1
font_02_sfnt_off000195cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195CD 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953