Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f787c79e9beb0a…

MALICIOUS

PDF

82.6 KB Created: 2021-03-08 14:26:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e4ad848a5bb64cd0a575bea638467f64 SHA-1: 9b18ba4fd3dcae024e1a7a8405d28c70d9ad8c94 SHA-256: e8f787c79e9beb0a3b17099ec6bb9dd9ea6dbc7d2bdd561abe284175e1edf429
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, flagged as a link farm for SEO purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the 'LOLBin token sequence' heuristic suggest attempts to execute code or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/strik?utm_term=black+boys+with+curly+hair PDF link annotation
    • http://jobauthor.online/air_force_officer_ranks_timelinef793b.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/81507533919hk3ko.pdfIn PDF document text
    • http://wukosuwusa.iblogger.org/instagram_videos_online_free.pdfIn PDF document text
    • http://smartcoin.design/how_to_make_cool_science_experimentst5m4z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_822c0a06c53b4603bbe83a8f4703a46e.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_4ff88635563945c4803d8e4072ca4b54.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxiweke/autoroot_tools_apk_xda.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/lolixesimezexagibekaz.pdfIn PDF document text
    • http://xivefasojag.epizy.com/pivadasipifuja.pdfIn PDF document text
    • http://donafilozevore.rf.gd/pizoboripo.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/punjabi_status_action_video.pdfIn PDF document text
    • http://leporib.epizy.com/wojapifipus.pdfIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_cf14a9da91234b0c8d894986181f8413.pdf?index=trueIn PDF document text
    • http://diwukimip.epizy.com/kayla_training_program.pdfIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_fedb52f03fac40e3931a93a0aa98d4c4.pdf?index=trueIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_3c0281598efa426e96e9e1a66a8d2f6f.pdf?index=trueIn PDF document text
    • http://varunogozanog.rf.gd/bootstrap_3_blog_templates_free.pdfIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_7e421c30558a43dba960f9741a691dfd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/install_apk_using_adb_mac.pdfIn PDF document text
    • http://lobexot.epizy.com/impossible_game_16_answer.pdfIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_d09e97244bee439e90b90c085b487b57.pdf?index=trueIn PDF document text
    • http://popirarubinuluk.rf.gd/kedivogik.pdfIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_f3055b1d78d148389dc12716c7dd0336.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/levovod/85591936177.pdfIn PDF document text
    • http://paveviv.rf.gd/definition_of_anticipation_guide.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_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 5336 bytes
SHA-256: 33a8af8366e624b1dc507f1257bcd9d8fba1f44f1439035a4e0f1faed816cb1b
font_01_sfnt_off00011971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11971 10336 bytes
SHA-256: c87ec81da9848bf84b6cfbe57a581f405f0f6d532c7d46d3a33af9518faa2cde

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