Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce44935334cfabdd…

MALICIOUS

PDF

82.8 KB Created: 2021-03-25 01:10:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2098aa45fda740204252be3e99e6623b SHA-1: 3eaa0588dc2ae055b48b506fcbf18e1c42b6a67c SHA-256: ce44935334cfabdda84426112375c5c4a40867b882c611e9679eb29adfbc8621
136 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The presence of external URIs and the 'ML_NYX_PDF_MALICIOUS' heuristic strongly suggest the document is designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'Bt wifi speed', likely a lure to entice users to click on the embedded malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://xajibur.ru/123?utm_term=bt+wifi++speed PDF link annotation
    • http://nezumogeto.iblogger.org/fairy_tales_shampoo_curly_q.pdfIn PDF document text
    • http://belkwigs.com/definition_of_economicsbx88b.pdfIn PDF document text
    • http://msertis.xyz/657639503249lit0.pdfIn PDF document text
    • http://lodixewovufosa.iblogger.org/billy_ocean_stay_the_night.pdfIn PDF document text
    • http://helpforteam.com/emily_posts_etiquette_19th_edition_free4w2sg.pdfIn PDF document text
    • http://forpost-electrica.ru/nodemcu_wifi_module_datasheetbx7d4.pdfIn PDF document text
    • http://gunofixe.medianewsonline.com/dapebekiwanepowiluwu.pdfIn PDF document text
    • http://cashtanks.fun/441959303289w3rq.pdfIn PDF document text
    • http://steelsho1.club/53435819223rpovb.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/88597218176.pdfIn PDF document text
    • http://idealslim-ordina.site/76515463036pvv68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_b371c4d8a8de4c0484ea48f34f54b45f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifamomove/7476924338.pdfIn macro / runtime command snippet
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_af366e81760e40bca79ffaea36e623b9.pdf?index=trueIn macro / runtime command snippet
    • https://s3.amazonaws.com/rijaliwiguvex/shooshoos_size_guide.pdfIn PDF document text
    • http://levewube.epizy.com/67997362150.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/forrester_report_on_chatbots.pdfIn PDF document text
    • http://dupetomumipur.rf.gd/netflix_full_movie_300mb.pdfIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_58351326bd3f458f9450bd3d49ccca53.pdf?index=trueIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_a5269c1ba2364a8895accb383bebefde.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/godfather_moe_greene_death_scene.pdfIn PDF document text
    • http://wujagenak.atwebpages.com/words_to_describe_sunset_air_quality.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/58275867220.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_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 4836 bytes
SHA-256: 257989616a19b42c13b573f5d9defb5966b38ea1af7cd4d814624cc82b7ba73f
font_01_sfnt_off0001164f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 11552 bytes
SHA-256: c285ee0c74dfe12674e988378220e7d41f6dcf58a2f837e0753092e61ba90374

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