Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed826c97cadfa736…

MALICIOUS

PDF

76.8 KB Created: 2021-04-20 01:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eedd0623abe27da5ba8a6e1b431c494d SHA-1: c53fd64f89cd8fd20f92e0fa7d19bc3d08ba7c89 SHA-256: ed826c97cadfa73681355b06730ca036595151deb90aaee72fc419f7f9017d08
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a lure for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a failed attempt to disguise the malicious nature by including what looks like metadata from the wkhtmltopdf tool.

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
  • 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://bologen.ru/strik?utm_term=what+is+success+in+life+quotes PDF link annotation
    • http://kunutudusoxa.mywebcommunity.org/alcools_apollinaire_italiano.pdfIn PDF document text
    • http://dusosax.66ghz.com/tezefesiwibine.pdfIn PDF document text
    • http://kevekozulanilim.sportsontheweb.net/5297906911.pdfIn PDF document text
    • http://kasiwewevono.iblogger.org/autocratic_leadership_meaning.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/repoxod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tibarokavuvuri.epizy.com/printable_cvc_words_with_pictures.pdfIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_b83e85619a6d427b816cfd093311479a.pdf?index=trueIn PDF document text
    • http://gogawepidaru.rf.gd/78117749476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/439bdb98-25d1-431d-b57d-e0042eb75dac/10674783056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/268119c7-5a63-45c7-a4d1-52fb2ec79350/emily_dickinson_poem_303_meaning.pdfIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/xamur.pdfIn PDF document text
    • https://633ee4a5-ef7f-4c35-8c02-ac6c60bc6361.filesusr.com/ugd/0ab374_4b9dc27f9a1649c7a8f4b8cd1da13f89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/lyreco_labels_template.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_c209665ed4234701a368810e21410258.pdf?index=trueIn PDF document text
    • http://zopopujeji.rf.gd/4d_toto_singapore_sweep_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/xututoxanew.pdfIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_76d1125ac53e4518a6d734c27d8d5588.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/how_do_i_change_my_bluetooth_to_english.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_b90e910a8af144198b6e08431de09f7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lumixi/79635944142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e8915d-c92c-4050-a17b-a55c8f681d59/why_is_my_directv_dvr_not_showing_all_recordings.pdfIn PDF document text
    • http://bolesumedinix.rf.gd/xotakoxafosawaniwipewu.pdfIn PDF document text
    • http://togewogovimome.epizy.com/encyclopedia_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/australia_snow_report_forecast.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_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 5012 bytes
SHA-256: eafa0c95f20adb14c7aaf4a4e86004c89c2f9225ed5a737d2953f571c62c92f5
font_01_sfnt_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 10732 bytes
SHA-256: cd44cccb35de7ab645401b598ab1c9cd35a42df0d003eab735b445b41380a309