Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b49a87d7ba3235…

MALICIOUS

PDF

78.5 KB Created: 2021-04-14 02:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 18aab9b14015cc4ffc9fefb5cb3d752e SHA-1: bbb1c4035b9e14064c7d6f4dfbf0a7d094f0cbbe SHA-256: 19b49a87d7ba32354e458eb231f53c8c27295a2089b7b66a2d8db5387b97ed83
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains. One critical heuristic identified links to known malicious redirector infrastructure, and another flagged it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=crossfit+training+over+50 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_601db0a964c29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448126/normal_60119572af7b5.pdfIn PDF document text
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/nafepakuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458614/normal_602e43f8e76e6.pdfIn PDF document text
    • http://optamorem.com/how_to_apply_swiffer_wet_jet_padsxas08.pdfIn PDF document text
    • https://xovadodelemowuz.weebly.com/uploads/1/3/1/3/131383330/muxidugefamafuxe.pdfIn PDF document text
    • http://srakan.space/54508766273vmipo.pdfIn PDF document text
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/nisozinagikubefenow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479441/normal_605d721521f82.pdfIn PDF document text
    • https://napifilimikap.weebly.com/uploads/1/3/1/6/131606974/ba64bff58a.pdfIn PDF document text
    • http://redtea.space/revelaciones_karina_yapork38xh.pdfIn PDF document text
    • https://cdn.sqhk.co/todusukiraxi/ejgjfjb/tedarizazerarejabawi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413707/normal_5ff773ec669e7.pdfIn PDF document text
    • https://sajoviginuxux.weebly.com/uploads/1/3/2/7/132712139/4fdcc963.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/g8hagf2/assamese_song_2019_djassam._com.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409421/normal_5fd6d2541d979.pdfIn PDF document text
    • http://luminar3-download.xyz/what_is_dawes_roll3laic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwagone.rf.gd/ataxia_cerebelar.pdfIn PDF document text
    • http://nareboveridur.epizy.com/zuvosa.pdfIn PDF document text
    • http://datidogebe.epizy.com/halter_top_dresses_formal.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_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 5132 bytes
SHA-256: f10762fb363445a1a8ca2db4ba061506020cae672b32d87d8cc07275bfb1b065
font_01_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 10884 bytes
SHA-256: 903ee58b6fb008ed1bfd8eb0142c6d78e817ecd96610e6b965a8ab89ad78a51c

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