Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2189faf4fa499d…

MALICIOUS

PDF

77.2 KB Created: 2021-03-29 00:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e203dec768d70e8ce7037cd888574e2a SHA-1: 63b7c9845532f775bafa6d940b4df40602a75544 SHA-256: cb2189faf4fa499d7f15e1da04ada1856539940577e4ae380d3fc9c5113ac6d6
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one specifically identified as a malicious redirector pointing to 'https://dafemum.ru/strik?utm_term=how+to+make+a+boyfriend+application'. The document body, though heavily obfuscated, contains text fragments that align with this lure. The presence of numerous links and the ML classifier's high confidence score indicate a phishing or redirection attempt.

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
  • 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 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=how+to+make+a+boyfriend+application In PDF document text
    • https://cdn.sqhk.co/pezolaje/XiwHyWl/furia_de_titas_2_resenha.pdfIn PDF document text
    • https://kirorasonosa.weebly.com/uploads/1/3/4/7/134743937/5198863.pdfIn PDF document text
    • http://mebotus.mypressonline.com/causative_exercises_advanced.pdfIn PDF document text
    • http://barodowo.iblogger.org/duzepexidamewekire.pdfIn PDF document text
    • http://nekidifuton.medianewsonline.com/rakiv.pdfIn PDF document text
    • https://cdn.sqhk.co/nivipanevi/jeogghi/android_and_apple_emojis_comparison.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/1801828.pdfIn PDF document text
    • https://kuxokovu.weebly.com/uploads/1/3/0/7/130738635/gakominugoset.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/eWbdiwJ/87156244380.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/0jdhije/sosopazubagofisam.pdfIn PDF document text
    • http://lamalegujig.22web.org/grammar_workbook_3rd_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/fabunavaxa/Jbjdiat/75245327620.pdfIn PDF document text
    • https://degetopej.weebly.com/uploads/1/3/4/7/134727915/9823156.pdfIn PDF document text
    • http://bezugunafagomup.22web.org/t_fal_optigrill_steak_recipes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae87c86-9f7a-4c9e-8003-ddfb9180c62c/how_to_day_trade_options_on_webull.pdfIn PDF document text
    • http://zaxowudupa.rf.gd/nonprofit_annual_report_template_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/076f993f-b878-4e06-8d89-dc4a9c8d24e9/kowisijenerolisubevomeg.pdfIn PDF document text
    • http://nadinuvuxogi.epizy.com/40073323365.pdfIn PDF document text
    • http://bikaxubu.rf.gd/rowdy_baby_hd_video_free.pdfIn PDF document text
    • http://feridelej.epizy.com/ruwejasuzijez.pdfIn PDF document text
    • http://terumalok.atwebpages.com/javascript_display_byte_array.pdfIn PDF document text
    • http://jodepitapebukov.rf.gd/administrao_pblica_conceito_natureza_fins_e_princpios.pdfIn PDF document text
    • http://jubegovasoranaz.rf.gd/16431377171.pdfIn PDF document text
    • http://bodudenijijeb.onlinewebshop.net/ayn_rand_objectivism.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_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 5484 bytes
SHA-256: 64d3d9778af7ec327387659ab2255736de7d995a96a709c9e28e843fb109f88a
font_01_sfnt_off0000fed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED4 11888 bytes
SHA-256: dd6c6fb8d9b2444b4040f4fbed04a4ce5070c0304da0d375318d57784f9e2cef