Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab949aac0d54eec…

MALICIOUS

PDF

88.9 KB Created: 2021-03-14 23:31:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 26519d2d9d8cc68acbcdc28cd5d8ec04 SHA-1: 72ae5e0d9b3f92ad4657aadff2b2198e4127f304 SHA-256: 4ab949aac0d54eec81a52002fe831a26ae49eedd474aa7d9d6877c51742fa669
66 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains keywords related to 'insect life cycle stages' and application metadata, indicating it's a lure. No scripts were extracted, but the presence of multiple external links points towards a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://ponafet.ru/wix?keyword=insect+life+cycle+stages PDF link annotation
    • https://tunorikiwevog.weebly.com/uploads/1/3/4/0/134097136/bolamijoforagix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5ff223c73dc4a.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/hp_deskjet_2132_printer_driver_download.pdfIn PDF document text
    • https://wujezevo.weebly.com/uploads/1/3/0/8/130874127/9131527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416938/normal_604825a11b1eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459329/normal_5fcf8649305f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453900/normal_5fc5ad382cf3c.pdfIn PDF document text
    • https://jizidetaji.weebly.com/uploads/1/3/4/6/134626841/9416768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392215/normal_60352a5e1ea20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492575/normal_5ffb312b44edd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470552/normal_603c0e559322d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489251/normal_604a75f968218.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/86062197769.pdfIn PDF document text
    • https://baxomowimesadud.weebly.com/uploads/1/3/5/3/135303612/fiwazonivifa-pukemetado-juferujedevo-jaduwojesuvogor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462714/normal_60300d1cabc18.pdfIn PDF document text
    • https://wokiliga.weebly.com/uploads/1/3/0/8/130814475/wovipalejinegi-litunot-xasegul-gajumakefuxur.pdfIn PDF document text
    • https://lilofuzaxodas.weebly.com/uploads/1/3/0/7/130775659/wokamebiwis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_6043eba3f2b33.pdfIn PDF document text
    • https://jedurabononip.weebly.com/uploads/1/3/1/4/131453193/8f71ecf37d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sawurawefivovo.myartsonline.com/circle_theorems_gcse_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/ruzixomavivunumabef.pdfIn PDF document text
    • http://ruzofugeru.myartsonline.com/kozarapu.pdfIn PDF document text
    • http://peledopa.myartsonline.com/excellence_in_business_communication_12th_edition_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/alanna_the_first_adventure_audiobook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/pujotovanasipavimukotukij.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_off00011f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8D 4992 bytes
SHA-256: 9130129141430c0d1ba8e698720872c127c945853f70cd32fcb12f2d7eb0e354
font_01_sfnt_off000130b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B0 10792 bytes
SHA-256: 988b6dbd5c920e06bbfc0649172c99685d0013dac6b409069fee4b2af586c56d