Malicious PDF — malware analysis report

Static analysis result for SHA-256 146aaebfa4d27405…

MALICIOUS

PDF

102.8 KB Created: 2021-03-22 16:10:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f4992d0175f4d0d417688c3a79d7e914 SHA-1: abbf1dfb5ad17adba720be159931c231c64acbfa SHA-256: 146aaebfa4d274054ad078c109640d561cf404878068bd99038b354783102a0c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically flagged as an external URI pointing to 'ponafet.ru'. The PDF structure and the presence of external links suggest it is designed to redirect users to potentially harmful websites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/award?keyword=vejiga+urinaria+anatomia+pdf PDF link annotation
    • https://cdn.sqhk.co/varipivokil/jd7hjii/plants_vs_zombies_2_movie_cartoon.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/catechism_of_the_catholic_church_english.pdfIn PDF document text
    • http://savineme.mywebcommunity.org/nibifuforez.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/hcPgiaa/aliexpress_dropshipping_center_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/cgh6ijf/leo_dictionary_app.pdfIn PDF document text
    • https://sulesebu.weebly.com/uploads/1/3/4/6/134634805/3571235.pdfIn PDF document text
    • https://gedofulijul.weebly.com/uploads/1/3/0/7/130775434/rotulabigubu.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/5282613.pdfIn PDF document text
    • https://cdn.sqhk.co/ribuwikoli/ihhdbib/tovubimuxenokojatolidew.pdfIn PDF document text
    • http://kusuraluzi.iblogger.org/canon_speedlite_580ex_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/hijaKie/34055066778.pdfIn PDF document text
    • https://mivebomuponi.weebly.com/uploads/1/3/1/3/131398008/rinojawawixas.pdfIn PDF document text
    • https://vororesefuvemux.weebly.com/uploads/1/3/0/8/130813496/vuxatupize.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://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_d640e088a7ea40f4aa658de3a6435107.pdf?index=trueIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/tirifivuladimiwud.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/xegojaxejiseza.pdfIn PDF document text
    • http://tosodesuvivat.epizy.com/workout_log_template_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/android_8_scrolling_screenshot.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_fb148bbc96c143489316677b63799e68.pdf?index=trueIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_43fe376432c943c2827f2906f5732cba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/bitdefender_antivirus_2019_free_with_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/reading_comprehension_class_8.pdfIn PDF document text
    • http://dinedolorexos.rf.gd/vuvumumatapawumenenegusug.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/libros_sobre_budismo_gratis.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_off00014525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14525 5072 bytes
SHA-256: 9fb9c44a19cdf7ac2980d1ce0b1e2e6d3cb07ecf3b1d491580de5635f47be13e
font_01_sfnt_off00015659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15659 12080 bytes
SHA-256: 3d269c1633cad2a65db2ae4e227361bfa2f2879275d47540159ef9791f2f4086
font_02_sfnt_off00017df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DF3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f